Skip to content
When autocomplete results are available use up and down arrows to review and enter to select. Touch device users, explore by touch or with swipe gestures.

Elegant winter maxi skirt

Shop Pinterest's top picks and inspiration for Elegant winter maxi skirt.
Flared Maxi Skirt Chic Cream Flared Maxi Skirt, Beige Flared Maxi Skirt For Fall, Flared Wool Skirt For Fall, Wool Flared Skirt For Fall, Winter Maxi Skirt, Relaxed Flared Fit, Beige Flared Maxi Skirt With Pockets, Chic Wool Flared Skirt, Beige Flared Cotton Maxi Skirt, Beige Cotton Flared Maxi Skirt
Chic Cream Flared Maxi Skirt
Beige Flared Maxi Skirt For Fall
Flared Wool Skirt For Fall
Wool Flared Skirt For Fall
Winter Maxi Skirt, Relaxed Flared Fit
Beige Flared Maxi Skirt With Pockets
Chic Wool Flared Skirt
Beige Flared Cotton Maxi Skirt
Beige Cotton Flared Maxi Skirt
Cashmere-like Flared Maxi Skirt
Buy the best Flared Maxi Skirt this winter at oglmove! This half skirt provides you with an infinite possibility of exquisite and elegant appearance!
OGLmove
Discover our exquisite collection of women’s dresses at OOTD Dress, perfect for every occasion. Choose from elegant evening dresses, chic party dresses, and casual summer dresses. Our selection features trendy maxi dresses, stylish midi dresses, and classic mini dresses, including the essential Little Black Dress (LBD). Embrace your unique style with beautiful vintage dresses, flattering bodycon dresses, and flowy bohemian dresses. Shop affordable designer dresses today and find your perfect fit High Waist Pleated Maxi Skirt For Winter, Winter Full Length Solid Skirt, Winter Solid Color Pleated Maxi Skirt, Cheap Long Skirt For Winter, Winter High Waist Pleated Maxi Skirt, Long Skirt For Winter, Winter Long Pleated Skirt In Solid Color, Casual Ankle-length Pleated Skirt, Casual Full-length Pleated Skirt
High Waist Pleated Maxi Skirt For Winter
Winter Full Length Solid Skirt
Winter Solid Color Pleated Maxi Skirt
Cheap Long Skirt For Winter
Winter High Waist Pleated Maxi Skirt
Long Skirt For Winter
Winter Long Pleated Skirt In Solid Color
Casual Ankle-length Pleated Skirt
Casual Full-length Pleated Skirt
US$53.20
Knitwear High Waist Patchwork Maxi Skirt For Women Pleated Skirts Fashion Autumn Loose Ruffled Female Knit Long Skirt New
Ootdress
This grey winter wool skirt is a classic piece of tailoring that will see you through rain or shine. It is cut with a flattering flared skirt to give you a wonderful shape. The winter skirt is perfect classic styling and ends at the ankle.  DETAILS: * 30% wool, 30% fiber, 40% polyester * Fully satiny liner * Two side pockets * Right zipper closure * Maxi wool skirt,long skirt * A line skirt, swing skirt * High waist skirt * Daily skirt * Perfect for Winter, autumn * Dry clean * Lean More about t Fall Flared Maxi Skirt, Elegant Wool Bottoms For Winter, Full Solid Skirt For Fall, Solid Full Skirt For Fall, Fall Solid Color Full Maxi Skirt, Winter Long Pleated Skirt In Solid Color, Wool Flared Skirt For Work, Wool Skirt For Formal Fall Occasions, Wool Flared Skirt Bottoms For Workwear
Fall Flared Maxi Skirt
Elegant Wool Bottoms For Winter
Full Solid Skirt For Fall
Solid Full Skirt For Fall
Fall Solid Color Full Maxi Skirt
Winter Long Pleated Skirt In Solid Color
Wool Flared Skirt For Work
Wool Skirt For Formal Fall Occasions
Wool Flared Skirt Bottoms For Workwear
US$75.65
Wool skirt, Long wool skirt, Maxi wool skirt, Womens swing wool skirt, A line wool skirt, High waisted skirt, Custom skirt, Xiaolizi 4608
Etsy
Compact Stretch Essential Tailored Maxi Skirt | Karen Millen Sleek Spring Pencil Skirt For Business Casual, Modern Fitted Long Skirt, Modern Fitted Long Pencil Skirt, Modern Office Midi Pencil Skirt, Classic Long Pencil Skirt For Spring, Modern Office Pencil Midi Skirt, Classic Long Flowy Skirt, Modern Midi Pencil Skirt For Office, Modern Midi Skirt For Workwear
Sleek Spring Pencil Skirt For Business Casual
Modern Fitted Long Skirt
Modern Fitted Long Pencil Skirt
Modern Office Midi Pencil Skirt
Classic Long Pencil Skirt For Spring
Modern Office Pencil Midi Skirt
Classic Long Flowy Skirt
Modern Midi Pencil Skirt For Office
Modern Midi Skirt For Workwear
US$59.00
Karenmillen US
Modest Dresses Fashion, Pleated Long Skirt, Clothing Hacks, Feminine Look, Modest Dresses, Casual Tee, Formal Occasion, Skirt Length, A Line Skirts
Modest Dresses Fashion
Pleated Long Skirt
Clothing Hacks
Feminine Look
Modest Dresses
Casual Tee
Formal Occasion
Skirt Length
A Line Skirts
US$57.90
🎁Elegant Solid Color A-Line Pleated Skirt
Stay effortlessly stylish and warm with this Women's High-Waist Fleece-Lined Woolen A-Line Skirt. Inspired by French fashion, this long skirt combines timeless sophistication with practical functionality, making it a perfect addition to your cold-weather wardrobe. Designed with a slimming, high-waist fit, it flatters your figure while providing exceptional comfort and elegance.The A-line silhouette offers a flowing, graceful look, while the drooping woolen fabric creates a soft and natural drape Elegant Fitted A-line Skirt, Stretch A-line Bottoms With Solid Color, Elegant A-line Solid Skirt, Elegant A-line Solid Color Skirt, Chic A-line Winter Skirt, Elegant Solid A-line Skirt, Winter White Wool Skirts, Long White Wool Skirt, Stretch A-line Skirt In Solid Color
Elegant Fitted A-line Skirt
Stretch A-line Bottoms With Solid Color
Elegant A-line Solid Skirt
Elegant A-line Solid Color Skirt
Chic A-line Winter Skirt
Elegant Solid A-line Skirt
Winter White Wool Skirts
Long White Wool Skirt
Stretch A-line Skirt In Solid Color
US$60.45
Women's High-Waist Woolen A-Line Skirt - Fleece Lined Elegance
Ribbed Midi Length Bottoms For Fall, Ribbed Midi Bottoms For Fall, Classic Midi-length Evening Bottoms, Fall Ribbed Midi Bottoms, Fall Ribbed Skirt For Work, Chic Maxi Skirt For Fall, Elegant Wide Leg Maxi Skirt For Fall, Elegant Long Skirt For Fall, Elegant Pleated Skirt For Daywear
Ribbed Midi Length Bottoms For Fall
Ribbed Midi Bottoms For Fall
Classic Midi-length Evening Bottoms
Fall Ribbed Midi Bottoms
Fall Ribbed Skirt For Work
Chic Maxi Skirt For Fall
Elegant Wide Leg Maxi Skirt For Fall
Elegant Long Skirt For Fall
Elegant Pleated Skirt For Daywear
US$79.00
Amoretu Women's Gold Silver Yarn Straight Knit Skirt
Indulge in the elegance of our French Grey High Waist Slim Fit Skirts, perfect for the fall season. Elevate your style with this luxurious and exclusive piece, designed for those with a refined taste for sophisticated fashion.Fabric: SpandexSize & Fit: This garment fits true to size.Length: Size S measures 33.54"from waist to hem.Waist:Fitted - very fitted at natural waist Hip: Loosely Fitted. room for hips.Hand Wash Cold. Total delivery time=Processing time+Shipping time. Processing time usuall Pencil Skirt Fall, Slim Fit Skirts, Fall Fashion Skirts, French Grey, Fall Wear, High Waisted Pencil Skirt, Fall Skirts, Fitted Skirt, Printed Midi Skirt
Pencil Skirt Fall
Slim Fit Skirts
Fall Fashion Skirts
French Grey
Fall Wear
High Waisted Pencil Skirt
Fall Skirts
Fitted Skirt
Printed Midi Skirt
US$50.99
French Grey High Waist Slim Fit Skirts Fall QC022 - S(Fit for EU 38-40, US 6-8, UK/AU 10-12, IT 42-44) / Grey
Lily Causal
Zara Midi Skirt Black New With Tag! Size: M High-Waisted Mini Skirt With Side Hidden In-Seam Zipper. A-Line Silhouette. Black | 9060/118 A54-Tl001 Fitted Solid Color Skirt For Winter, Fitted Solid Skirt For Winter, Winter Fitted Solid Color Skirt, Classic Flowy Skirt For Fall, Solid Long Pencil Skirt For Fall, Classic Fall Skirt, Flared Skirt For Workwear In Fall, Winter Solid Color Pencil Skirt, Fitted Casual Maxi Skirt For Winter
Fitted Solid Color Skirt For Winter
Fitted Solid Skirt For Winter
Winter Fitted Solid Color Skirt
Classic Flowy Skirt For Fall
Solid Long Pencil Skirt For Fall
Classic Fall Skirt
Flared Skirt For Workwear In Fall
Winter Solid Color Pencil Skirt
Fitted Casual Maxi Skirt For Winter
Zara Skirts | Zara Midi Skirt Black Size M New With Tag! | Color: Black | Size: M
Zara Midi Skirt Black New With Tag! Size: M High-Waisted Mini Skirt With Side Hidden In-Seam Zipper. A-Line Silhouette. Black | 9060/118 A54-Tl001
FEATURES TIMELESS A-LINE SILHOUETTE: This elegant A-line skirt offers a flattering fit for all body types, gently flaring out from the waist for a graceful and feminine look. Perfect for casual or formal occasions. STYLISH PLEATED DETAILS: Pleats add movement and depth to the skirt, creating an elegant and sophisticated look. Whether you wear it to the office or a night out, the pleated detail will make you turn heads. HIGH QUALITY SOFT FABRIC: Crafted from soft and breathable fabric, this pleated skirt provides all-day comfort while maintaining its shape. Its smooth texture feels luxurious against the skin, making it a wardrobe essential. VERSATILE SOLID COLOR DESIGN: The skirt features a clean solid color design, making it easy to pair with any top, whether its a casual tee, blouse or sw Modest Dresses Fashion, Pleated Long Skirt, Clothing Hacks, Feminine Look, Modest Dresses, Casual Tee, Formal Occasion, Skirt Length, A Line Skirts
Modest Dresses Fashion
Pleated Long Skirt
Clothing Hacks
Feminine Look
Modest Dresses
Casual Tee
Formal Occasion
Skirt Length
A Line Skirts
US$57.90
Elegant Solid Color A-Line Pleated Skirt Rouge-85cm
staticom.com
Maxi women skirt knitted from soft 100% wool. High-waisted model with comfortable elasticated waistband. Natural material ensures that it doesn't accumulate static electricity, gives pleasant warmth and comfort in wearing. The wool used is wear resistant and isn't pilling over time if cared for according sewn-in care label. Available in several colors: Light gray (on the model), full color palette listed on the last photo starting from pure black at the bottom: pure black, orange, caramel beige, Solid Full Length Skirt For Fall, Full Length Skirt For Fall, Solid Full-length Skirt For Fall, Winter Full Length Solid Skirt, Fitted Casual Maxi Skirt For Winter, Full Length Knit Bottoms For Winter, Full Length Lined Skirt For Winter, Gray Knit Bottoms For Fall, Cashmere Wide Leg Bottoms For Winter
Solid Full Length Skirt For Fall
Full Length Skirt For Fall
Solid Full-length Skirt For Fall
Winter Full Length Solid Skirt
Fitted Casual Maxi Skirt For Winter
Full Length Knit Bottoms For Winter
Full Length Lined Skirt For Winter
Gray Knit Bottoms For Fall
Cashmere Wide Leg Bottoms For Winter
US$204.55
Wool Knit Maxi Skirt: High-Waisted A-Line, Personalized Length
Etsy
Details: * Wool blend fabric with polyester lining * Two side pockets * Right zipper closure * Back elastic waist * Midi length skirt * Winter skirt, Autumn skirt * Dry clean ★★NOTE ABOUT SIZE: If you cannot find your size in the chart above , we accept custom-made orders. The basic measurements we need for making your order are: [bust]: the fullest part of your bust, not bra size; [natural waist]: the thinnest part of your upper body; [hips]: the fullest part of your hips; Your overall height. ★★ Taking Care: Dry clean ★★ Our photos are original, with some edited using AI for clarity. Although we strive for accuracy, the actual product may differ slightly from the images. Fall Flared Maxi Skirt, Full Solid Skirt For Fall, Solid Full Skirt For Fall, Fall Solid Color Full Maxi Skirt, Wool Skirt For Formal Fall Occasions, Fitted Maxi Skirt For Fall Workwear, Fall Full Lined Maxi Skirt, Chic Full Maxi Skirt For Winter, Formal Wool Skirt For Fall
Fall Flared Maxi Skirt
Full Solid Skirt For Fall
Solid Full Skirt For Fall
Fall Solid Color Full Maxi Skirt
Wool Skirt For Formal Fall Occasions
Fitted Maxi Skirt For Fall Workwear
Fall Full Lined Maxi Skirt
Chic Full Maxi Skirt For Winter
Formal Wool Skirt For Fall
US$63.20
Wool Skirt, Winter Skirt Women, A-Line Wool Skirt, Long wool skirt, Womens wool skirt, Plus size wool Skirt, Custom skirt L0649
Etsy
Lasaky - High-Waisted Umbrella Skirt for Dancing and Letter Pattern Design High Waist Burgandy Long Skirt, Letter Pattern Design, Body Skirt, Umbrella Skirt, Umbrella Designs, Dance Skirt, Daily Dress, Knee Length Skirt, Types Of Skirts
High Waist Burgandy Long Skirt
Letter Pattern Design
Body Skirt
Umbrella Skirt
Umbrella Designs
Dance Skirt
Daily Dress
Knee Length Skirt
Types Of Skirts
US$36.99
Lasaky - High-Waisted Umbrella Skirt for Dancing and Letter Pattern Design - Burgundy, M
Lasaky Fashion Boutique
DETAILS: * 30% wool, 30% fiber, 40% polyester * fully satiny liner * Two side pockets * back zip closure * pleated skirt, circle skirt * High waist skirt * circle wool skirt * Perfect for Winter, autumn * Lean More about the items From the FAQs on the page bottom Mode size Height 170 cm (5′ 6″) Bust 90 cm (35") Waist 70 cm (27") She wears size S CUSTOM MADE SERVICE If you * Change other color * Can't find your size in our size Chart * Change the Style * Change the length * Your Height is not Bet Fitted Solid Color Skirt, Stretch Solid Color Fall Skirt, Fall Stretch Skirt Solid Color, Fall Stretch Solid Color Skirt, Solid Beige Skirt For Fall, Solid Color Full Skirt For Party, Winter Solid Color Skirt, Winter Solid Color Lined Skirt, Solid Fall Party Skirt
Fitted Solid Color Skirt
Stretch Solid Color Fall Skirt
Fall Stretch Skirt Solid Color
Fall Stretch Solid Color Skirt
Solid Beige Skirt For Fall
Solid Color Full Skirt For Party
Winter Solid Color Skirt
Winter Solid Color Lined Skirt
Solid Fall Party Skirt
US$80.10
Wool skirt, Wool Midi Skirt Women, Wool Circle Skirt, Solid Winter Skirt Women, Swing Skirt, High Waist Flared Skirt, Minimalist Skirt 3247
Etsy
Elevate your wardrobe with our elegant A-line pleated midi skirt, designed for the fashion-forward woman who appreciates both style and comfort. Crafted from high-quality fabric, the skirt drapes beautifully, offering a graceful silhouette that's perfect for any occasion. Its earthy tone provides a versatile palette, making it an essential addition to your seasonal wardrobe.The skirt features a chic high-waisted design, accentuated by a sleek belt that cinches the waist elegantly. The pleats add a touch of sophistication, allowing for effortless movement whether you're at the office or a casual brunch. Pair it with a fitted blouse or a cozy sweater for a timeless and refined look that never goes out of style.The midi length offers the perfect balance between modern flair and classic charm, Solid Color Skirt For Winter Workwear, Casual Solid Color Winter Pleated Skirt, Solid Color Midi Skirt For Fall, Solid Color Pleated Skirt For Work In Fall, Fall Midi Skirt In Solid Color, Solid Color Winter Workwear Skirt, Elegant Non-stretch Skirt, Solid Color Maxi Skirt For Fall Workwear, Long Solid Color Pleated Skirt For Spring
Solid Color Skirt For Winter Workwear
Casual Solid Color Winter Pleated Skirt
Solid Color Midi Skirt For Fall
Solid Color Pleated Skirt For Work In Fall
Fall Midi Skirt In Solid Color
Solid Color Winter Workwear Skirt
Elegant Non-stretch Skirt
Solid Color Maxi Skirt For Fall Workwear
Long Solid Color Pleated Skirt For Spring
US$29.00
High-Waisted Pleated Midi Skirt with Belt
Luulla
Banana Republic Jewel Green Sweater Skirt Nwt Has A Flare/A Line Smoke Free Home Pull On No Pockets 14.5 Elastic Waist 30 Long Winter Full Length Stretch Skirt, Winter Full Length Solid Skirt, Fitted Casual Maxi Skirt For Winter, Green Long Skirt Bottoms For Fall, Casual Midi-length Bottoms For Winter, Casual Midi Length Bottoms For Winter, Chic Stretch Maxi Skirt For Winter, Casual Winter Midi Bottoms, Green Midi Length Workwear Bottoms
Winter Full Length Stretch Skirt
Winter Full Length Solid Skirt
Fitted Casual Maxi Skirt For Winter
Green Long Skirt Bottoms For Fall
Casual Midi-length Bottoms For Winter
Casual Midi Length Bottoms For Winter
Chic Stretch Maxi Skirt For Winter
Casual Winter Midi Bottoms
Green Midi Length Workwear Bottoms
Banana Republic Skirts | Banana Republic Pull On Sweater Skirt Jewel Green Medium Nwt | Color: Green | Size: M
Banana Republic Jewel Green Sweater Skirt Nwt Has A Flare/A Line Smoke Free Home Pull On No Pockets 14.5 Elastic Waist 30 Long
Zara Black Skirt Minimalist Top Seller Fashion Modest Black Classy Solid Long Sleeve Skirt Suit For Fall, Fall Long Sleeve Skirt Suit, Fitted Maxi Skirt For Fall Workwear, Black Long Skirt For Work, Sleek Evening Pencil Skirt With Lining, Sleek Lined Pencil Skirt For Evening, Sleek Evening Midi Pencil Skirt, Sleek Long Pencil Skirt, Pleated Maxi Skirt For Evening In Fall
Solid Long Sleeve Skirt Suit For Fall
Fall Long Sleeve Skirt Suit
Fitted Maxi Skirt For Fall Workwear
Black Long Skirt For Work
Sleek Evening Pencil Skirt With Lining
Sleek Lined Pencil Skirt For Evening
Sleek Evening Midi Pencil Skirt
Sleek Long Pencil Skirt
Pleated Maxi Skirt For Evening In Fall
Zara Skirts | Zara Black Skirt | Color: Black | Size: M
Zara Black Skirt Minimalist Top Seller Fashion Modest Black Classy
Black Zara High Elastic Waist Stretch Knit Maxi Skirt High-Waist Skirt Featuring An Elastic Waistband And Vent At The Back Of The Hem. Fitted Versatile Maxi Skirt For Work, Versatile Fitted Maxi Skirt For Work, Casual Evening Maxi Skirt With Relaxed Fit, Casual Full Length Maxi Skirt For Night Out, Casual Full-length Maxi Skirt For Night Out, Fitted Casual Maxi Skirt For Winter, Solid Evening Skirt For Fall, Fitted Long Versatile Skirt, Solid Color Evening Skirt For Fall
Fitted Versatile Maxi Skirt For Work
Versatile Fitted Maxi Skirt For Work
Casual Evening Maxi Skirt With Relaxed Fit
Casual Full Length Maxi Skirt For Night Out
Casual Full-length Maxi Skirt For Night Out
Fitted Casual Maxi Skirt For Winter
Solid Evening Skirt For Fall
Fitted Long Versatile Skirt
Solid Color Evening Skirt For Fall
Zara Skirts | Black Zara High Elastic Waist Stretch Knit Maxi Skirt (Nwt) | Color: Black | Size: S
Black Zara High Elastic Waist Stretch Knit Maxi Skirt High-Waist Skirt Featuring An Elastic Waistband And Vent At The Back Of The Hem.
A burgundy woolen skirt is a perfect basis for a stylish, well-thought-out wardrobe. Our pleated skirt is the choice of practical women: it warms, doesn`t restrict movement, is combined with clothes of different styles, and most importantly - made of quality materials. Features of the model:  * made from fine wool * rayon lining * below the knee (length - 72 cm) * zipper on the back * pockets THIS SKIRT IS ALSO AVAILABLE IN OTHER FABRICS:  https://www.etsy.com/listing/953254971/wide-skirt-beige-skirt-wool-skirt?click_key=c4bd4f58e310bf15d7c4191462c1485c153fc3cf%3A953254971&click_sum=fa7912c7&ref=shop_home_active_14&pro=1 IMPORTANT NOTICE: Please agree with us your size before making an order. MEASUREMENT CHART: 6 (USA) / 36(EU) / 42 (UA) - 33"/26"/35" 8 (USA) / 38(EU) / 44 (UA) - 34,5"/28" Classic Flowy Skirt For Fall, Classic Fall Skirt, Solid Long Pencil Skirt For Fall, Flowy Midi Skirt For Business Casual, Fall Midi Length Lined Pencil Skirt, Flared Skirt For Workwear In Fall, Winter Office Pleated Bottoms, Pleated Flared Maxi Skirt For Fall, Flowy Lined Skirt For Business Casual
Classic Flowy Skirt For Fall
Classic Fall Skirt
Solid Long Pencil Skirt For Fall
Flowy Midi Skirt For Business Casual
Fall Midi Length Lined Pencil Skirt
Flared Skirt For Workwear In Fall
Winter Office Pleated Bottoms
Pleated Flared Maxi Skirt For Fall
Flowy Lined Skirt For Business Casual
US$235.00
Burgundy pleated woolen skirt, red midi skirt, winter skirt, solemn skirt, skirt with folds, warm skirt, business skirt with pockets, boho
Etsy
Elevate your wardrobe with this long maxi wool skirt, designed to combine style, comfort, and functionality. The flattering plus-size fit ensures every woman feels confident and beautiful. Featuring a timeless beige tone, this skirt is versatile enough for both casual and formal occasions. Details: * 30% wool, 30% fiber, 40% polyester * polyester lining * Two side pockets * Right zipper closure * Back elastic waist * Plus size ankle length skirt * A-line skirt, casual skirt, formal skirt * Winter skirt, Autumn skirt * Dry clean ★★NOTE ABOUT SIZE: If you cannot find your size in the chart above , we accept custom-made orders. The basic measurements we need for making your order are: [bust]: the fullest part of your bust, not bra size; [natural waist]: the thinnest part of your upper body; [ Winter Wide Leg Skirt With Pockets, Wool Flared Skirt For Work, Wool Flared Skirt Bottoms For Workwear, Fitted Beige Skirt For Winter, Long Skirt With Pockets For Winter, Solid Full Skirt For Winter, Solid Color Full Skirt For Winter, Winter Solid Color Full Skirt, Winter Full Skirt In Solid Color
Winter Wide Leg Skirt With Pockets
Wool Flared Skirt For Work
Wool Flared Skirt Bottoms For Workwear
Fitted Beige Skirt For Winter
Long Skirt With Pockets For Winter
Solid Full Skirt For Winter
Solid Color Full Skirt For Winter
Winter Solid Color Full Skirt
Winter Full Skirt In Solid Color
US$75.65
Long wool Skirt Womens, A-Line Maxi Skirt, Flowy wool Skirt, Classic Beige wool skirt, High-Waisted wool skirt, handmade skirt L0706#
Etsy

Shop related categories

Formal Winter Velvet Midi Dress
A Line Winter Skirt
Classic Winter Mini Dress For Formal Occasions
Chic V-neck Dress For Red Carpet
White Dressy Short Sleeve Dress
Elegant Two-piece Set For Workwear
Blue Winter Dress Formal
White Structured Dress For Work

Shop trends

Nails
Body Care
Dream Shoes
Glinda Dress
Tv Girl Wallpaper
Ralph Lauren Thanksgiving Table
Pinky Ring
Bows For Wreaths
Unique Ugly Christmas Sweater
Gold Ring Stack