NBD X REVOLVE Siena Crop Top in Black. - size M (also in S,XS) NBD X REVOLVE Siena Crop Top in Black. - size M (also in S,XS) A sporty silhouette meets luxe fabrication in the Siena Crop Top by NBD. This REVOLVE exclusive style is made of crushed velvet and features wide shoulder straps that lead to a plunging triangle front for a bust-enhancing effect.. Self: 92% poly 8% elastaneLining: 100% poly. Hand wash cold. Adjustable hook and eye back closures. Crushed velvet fabric. NBDR-WS149. NBDTO106QS 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.