Which size should I choose?

Each size is drafted on its own. Open the size guide above: these are the dress's own measurements, so compare them with a dress you already wear. Between two sizes, take the larger one. Wrong size after all? Email help@lauven.shop with your order number and the size you need — our team will arrange the exchange.

Can I cancel my order?

Yes, free of charge within 24 hours: write to help@lauven.shop with your order number.

Women’s Black Maxi Dress — Square Neckline, Strappy Back, Ankle-Length, Slim Fit, Formal, Evening Onyx Dress

Onyx Maxi Dress

Square Neckline Maxi Dress in Black

$99.95

Early Black Friday: 2nd piece 50% off

Size XS S M L XL

Size guide

Garment measurements — inches and centimetres.

Size	Bust	Waist
XS	32" (81 cm)	24" (61 cm)
S	34" (86 cm)	26" (66 cm)
M	35.5" (91 cm)	28" (71 cm)
L	38" (97 cm)	30" (76 cm)
XL	40" (102 cm)	33" (84 cm)

These are garment measurements, not body measurements. Cuts vary, so where a dress carries its own chart that chart is shown here instead. The surest method: measure a dress you already wear and compare.

Model wears size S · Height 5'8" (173 cm)

Free delivery, tracked
30-day returns
Cut and sewn for you

Early Black Friday

Buy 1, get the 2nd 50% off

Add any 2 pieces to your bag: the lower-priced one is 50% off. Applied automatically, no code needed.

The Onyx Maxi Dress is made from a premium synthetic blend of polyester and spandex, featuring a smooth knitted fabric with high elasticity for a slim, figure-flattering fit. This elegant dress offers an ankle-length silhouette with wide shoulder straps and a modern square neckline that enhances its timeless appeal.

The standout feature is the open back with intricate criss-cross tie detailing, adding a contemporary and chic touch to the design. The pullover style closure and sleeveless profile ensure comfort and ease of wear, perfect for formal and evening occasions.

Ideal for upscale events, cocktail parties, and sophisticated gatherings, the Onyx Maxi Dress pairs beautifully with statement heels and subtle accessories. Its classic black hue provides versatile styling options for a polished, refined look.

Product details

Style Features

Wide shoulder straps with square neckline
Open back with criss-cross tie detail
Ankle-length maxi silhouette
Slim, stretch-enhanced fit
Soft, smooth synthetic knit fabric

Specifications

Materials & Fabric Composition: Polyester and Spandex blend
Care Instructions: Hand wash or gentle machine wash recommended
Size & Fit Details: Slim fit with high elasticity
Measurements: Model height 5'8" wearing size Small
Closure: Pullover style

Styling Guide

Wear with sleek heels to enhance the silhouette
Add minimalistic jewelry for elegant accents
Complete the look with a chic clutch in neutral tones

A modern maxi dress designed for elegant evenings and sophisticated style.

Perfect for formal events, cocktail parties, and upscale occasions.

Elevate your wardrobe with this timeless black maxi dress.

Product Details

Color: Black
Material: Polyester and Spandex
Pattern: Solid
Available Sizes: XS, S, M, L, XL

Where the supplier listed it, the size and height of the model are shown under the size selector — use them as your reference point.

Garment measurements, fabric composition and care are in the Specifications section of the description above. Where a lining is used it is a full lining, not a half slip.

Fabric composition and care instructions are listed in the description above.

Where a lining is used it is a full lining, not a half slip.

Usually 2 to 3 weeks: it is cut and sewn once you order, then shipped free with tracking. Each country has a latest delivery date — if we miss it, you can ask for a full refund.

See the date for your country

Yes, within 30 days of delivery, unworn and with its tags. To start it, email help@lauven.shop with your order number. For a change of mind or a size issue the return postage is yours; for a damaged or wrong item it is ours.

Your dress is cut and sewn in our partner workshop once you order it — no overstock, no end-of-season pile, nothing made that nobody wanted.

Free tracked delivery, and 30 days to change your mind. See delivery times for your country

Style it with

The Lauven gift box, closed and tied with the black ribbon

The box

It arrives like this

Folded in printed tissue, sealed, and set in a white magnetic box tied with a ribbon. On top, a card signed by Laura, who founded Lauven in Edinburgh.

White magnetic box, black satin ribbon, printed tissue, signed card.

Made to order, not made to sit

What	Lauven	The usual
The cut	Sewn after you order	Made in bulk, months ahead
The sizes	Measurements published, size by size	One block reused across styles
The stock	Nothing made that nobody ordered	Overstock, then markdowns