black fishtail dress Marlowe trim is 82% nylon and 18% spandex Norma Kamali Walter Fishtail Gown

Structured woven fabric with lace trim and layered ruffle skirt construction

As Wired.com points out, a digital analysis of the dress photo shows that one of the spots of black trim is actually orange in the photo

When in doubt, simply opt for the fanciest dress or suit you own

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It comes in tons of wedding guest-appropriate colors, plus white if youre the bride looking for a bridal shower/post-wedding brunch look