Sherri Hill 56821 comes in the following colors: Black. $498 is the Formal Approach best price guarantee for style 56821 by Sherri Hill. Shop with confidence, Formal Approach is an authorized Sherri Hill prom dress store. We only offer authentic designer prom dresses. Sherri Hill 56821 is available in the following sizes: 000, 00, 0, 2, 4, 6, 8, 10, 12, 14, 16, 18.