twenty Stretch One Sleeve Dress in White. - size XS (also in ) twenty Stretch One Sleeve Dress in White. - size XS (also in ) 92% rayon 8% spandex. Hand wash cold. Unlined. Hidden back zip and hook closures. TWER-WD50. VD5C 120. Twenty has transformed a fashion essential by giving the classic knit tee a luxurious and modern take. Crafted from amazing fabric, twenty creates super soft tees, knit dresses, bodycon skirts, and cozy sweatpants that will quickly become everyday staples in your wardrobe.