XS = US 0-2 , S = US 4-6 , M = US 8-10 , L = US 12 , XL = US 14. Peacock Vintage 20's Dress Material: beaded and sequined polyester fabric. Evening, party, prom, cocktail dress, vintage 1920s style gatsby costume dress flapper dresses 1920s. Beaded sequin Great Gatsby dress. Decorated with sequined peacock pattern, inspired by the glamour of the 1920s Great Gatsby era. Not machine washable. Hand wash or dry clean.