Onyx Maxi Dress
Onyx Maxi Dress
Onyx Maxi Dress
Onyx Maxi Dress
Onyx Maxi Dress
Onyx Maxi Dress
Onyx Maxi Dress
Onyx Maxi Dress
Onyx Maxi Dress
Onyx Maxi Dress
Onyx Maxi Dress

Onyx Maxi Dress

★ ★ ★ ★ ★ 4,8/5 (109 reviews)
Regular price $69.95 Sale price$39.99 Save $29.96
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Color
Size
  • Shipping time: 3–7 business days
  • In stock, ready to ship
  • Inventory on the way

Some nights call for something unforgettable. This is that dress.

The Onyx Maxi Dress is sculpted to follow every curve, with a square neckline that frames the décolleté and ruched detailing at the waist that pulls everything in effortlessly, beautifully. Then comes the slit. Cutting high up the thigh, it turns every step into a statement.

All black. All intention. Zero compromise.

This is the dress you reach for when you want to walk in and own the room. The one that photographs like a campaign and feels like a second skin. Dressed up with heels and a slick updo, or styled back with barely-there sandals, the Onyx doesn't ask for much, because it already has everything.

Wear it once and it becomes the one they always ask about.

Details
— Square neckline with thick shoulder straps
— Ruched waist detailing
— Asymmetric draped skirt panel
— High thigh slit
— Floor-length / ankle-length
— Solid colour — pull-on closure — no zip
— Sleeveless

Fit
— True to size — slim fit through body
— Slight stretch — no extra sizing needed
— Ankle-length with dramatic slit

Care
— Cold wash recommended
— Do not tumble dry

— Polyester & elastane blend
— Synthetic fibre — knitted construction
— Slight elasticity stretch

Finding the right fit is important to us. Our pieces are designed to fit true to size, with a flattering and comfortable silhouette.

If you are between sizes, we recommend sizing up for a more relaxed fit.

Need help choosing a size?


If you’re unsure about sizing, feel free to contact our support team at support@blairmercer.com.

We’ll be happy to help you find the perfect fit.

Testimonials

★★★★★

I ordered the chocolate brown and it is absolutely stunning. The square neckline is so flattering and the ruching at the waist hides everything you want hidden while accentuating all the right curves. This dress is a 10/10.

Lauren H.
Los Angeles, CA
★★★★★

Went with the emerald green for a formal gala and received nonstop compliments. The color is deep and rich, not cheap-looking at all. The thigh slit is daring but the overall silhouette keeps it classy. Felt like a real-life video vixen.

Gabrielle S.
Atlanta, GA
★★★★★

I chose the dusty blue with sheer gloves for my senior prom and literally everyone stopped to stare when I walked in. The dress is incredibly well-structured, it held everything in place all night without any adjustments. Worth every single penny.

Peyton H.
Ottawa, ON
★★★★★

The plum/purple color is absolutely gorgeous. It photographs like a dream and the fabric has a beautiful drape to it. The high slit is perfectly placed, sexy but not over the top. I wore this to a birthday party and felt completely unstoppable.

Mia C.
Miami, FL
★★★★★

I got the charcoal grey and it's incredibly versatile, dressy enough for a black-tie event but not so over-the-top that it feels costumey. The square neckline gives it such a modern, sophisticated feel. Only four stars because I wish it came with built-in support for fuller busts.

Kelsey F.
New Orleans, LA
★★★★★

This is the most flattering dress I have ever owned. The ruching along the waist and hip creates the most incredible hourglass shape. I ordered the forest green and the color stayed rich and vibrant even after washing. Absolutely obsessed.

Cassandra V.
Chicago, IL
★★★★★

Ordered the brown for my company's holiday gala and got called 'the most elegant woman in the room' by three different people. The thick straps are a blessing; so much better than spaghetti straps for actually feeling secure and supported all evening.

Riley B.
Dallas, TX
★★★★★

I've bought this dress in two colors already and I'm eyeing a third. The fit is consistently perfect across both, true to size with just the right amount of stretch. The thigh slit moves beautifully when you walk. It has such an effortless, confident energy.

Jade T.
Phoenix, AZ
★★★★★

The sheer gloves styled with it take the look completely to another level.

Valéria H.
San Francisco, CA

OVER 5.000+ PEOPLE ARE WEARING BLAIR MERCER

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About us

At Blair Mercer, we believe every woman deserves to feel confident and beautiful.

We specialize in elegant dresses and carefully selected fashion pieces designed to bring style, comfort, and confidence to your everyday wardrobe.

Our goal is simple: to help you find outfits that make you look good, feel good, and express your style effortlessly.


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