Keep It Sleek Onyx Black Plus Size Fitted Formal Dress

Sexy can be sophisticated. Keep It Sleek is an Onyx Black plus size fitted formal dress designed to celebrate your curves without relying on sparkle to make an impact. Lustrous stretch satin follows the body, while a draped sweetheart neckline softens the structured corset bodice. The Basque waist dips below the natural waist to emphasize the sculpted silhouette, with ruching adding shape through the hips. Slim straps crisscross in back above the lace-up closure for a modern finish. A slit breaks up the long fitted skirt, and a sweep train finishes the look with just enough drama. Wear it to Prom 2027, a black-tie wedding, gala, military ball, Mardi Gras ball, formal fundraiser or any elegant evening event that calls for sophisticated glamour.

Why You’ll Love It

The drama comes from the silhouette. Lustrous stretch satin, a draped sweetheart neckline and a sculpted Basque waist create a sleek look with a sexy edge. Ruching adds dimension through the fitted silhouette, while the slit and sweep train keep the long skirt moving. With no sequins, stones or appliqués competing for attention, the curves, and the woman wearing them, take center stage.

Fit & Feel

Stretch satin follows your curves, while the soft stretch-knit lining moves with you. Interior boning gives the corset-style bodice structure, and built-in bust cups add support. The Basque waist extends below the natural waist to create a long, sculpted line. Slim straps crisscross in back above a lace-up closure with modesty panel, which lets you adjust the bodice fit.

Availability

More Sizes on Reorder

Love This Silhouette?

Keep It Sleek, Style SC7426, is also available in Blush Pink, Lavender Purple, Royal Blue, Chocolate Brown, Hunter Green, and Cherry Red.

• Slim silhouette
• Satin fabric
• Floor length
• Hollow to hem measures 61 inches
• Sweetheart neckline
• Draped bodice, exposed boning and interior cups with pleats
• Lined bodice
• Criss-cross spaghetti straps
• Sleeveless
• Basque waistline
• Fitted skirt with ruching
• Left leg slit
• Skirt fully lined in stretch knit
• Strappy back
• Lace-up back with modesty panel
• Sweep train

• Model is 5'8 inches tall wearing a size 16
• Fit to your waist
• Allow for alterations
• Spot clean only

Need sizing help?
Contact our Fashion Team.

Q: How do I style a black long formal evening gown?

A: Let the sleek black satin set the mood, then make the look your own. Add silver or crystal jewelry for classic evening glamour, gold for warmth, or a pop of color with statement earrings, shoes or a clutch. For Prom, have fun with sparkle; for a black-tie wedding, gala or formal ball, keep the accessories polished and let the sculpted silhouette do the talking.

Q: How does this fitted plus size formal dress fit?

A: Stretch satin follows your curves, while the soft stretch-knit lining moves with you. Interior boning gives the bodice structure, and the Basque waist extends below the natural waist to create a long, sculpted line. The lace-up back lets you adjust the bodice fit, while ruching adds dimension through the fitted silhouette.

Q: What kind of bra can I wear with this fitted formal gown?

A: The corset-style bodice has interior boning and built-in bust cups for structure and support, so you may find you don’t need a traditional bra. If you prefer additional support, look for a specialty undergarment that works with the sweetheart neckline and crisscross back.

We ship UPS for all domestic retail shipments.

Transit Times:

- Ground (3-5 business days)
- Three-Day Air (3 business days)
- Two-Day Air (2 business days)
- Overnight Air (1 business day)

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Whenever possible, we exchange merchandise for size, color or another style. Sydney's Closet offers free ground shipping to send you the exchange item(s).

All returns need a RA to be processed. You must get a RA within 5 (five) days of receiving your items.

Follow the instructions on our returns & exchanges portal.