Formal Evening Gown. Violet Stretch Tank Dress for Prom, Party, Wedding by Sean Collection (8820) Polyester Sizes run small. Check your measurements against the Formal Gallery size chart posted with product images. XXS=0, XS=2, S=4, M=6, L=8, XL=10 Do not use the Amazon Standard Size Chart to determine fit Stretch Poly Charmeuse; Handbeading; Pleating and Jewel Brooch at Bodice Front slit; Built-in bra pad; Dry Clean Only; Imported Perfect for evening, social occasion