NBD Lex Dress in Black. - size M (also in ) NBD Lex Dress in Black. - size M (also in ) At ease yet entirely on point. The Lex Dress from NBD x REVOLVE is crafted from stretchy jersey knit fabric with a slouchy one-shoulder neckline that elevates this simple mini into chic, night out wear.. Self: 100% cottonContrast: 96% cotton 4% spandex. Unlined. Elasticized neckline. Knit fabric. NBDR-WD934. NBS028QS 17. For the girl who's the life of the party. For the girl who's always up for a glass of champagne. For the girl who likes to keep her closet as filled with as her social calendar, there's NBD. The young-at-heart line features dresses that every it girl covets and pieces that are sexy, flirty, fun and now.