Formal Evening Gown. Strapless 2pc Dress for Prom, Party, Wedding by Sean Collection (260) Satin 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 Satin handbeaded corset top with mermaid skirt; Satin; Lace-up Back Front slit; Built-in bra pad; Dry Clean Only; Imported Perfect for evening, social occasion