Rachel Allan 70721 sequin prom dresses are offered in Black Tangerine, Lilac Purple, Navy Fuchsia, Turquoise. $598 is the Formal Approach best price guarantee for style 70721 by Rachel Allan. Shop with confidence, Formal Approach is an authorized Rachel Allan prom dress store. Rachel Allan 70721 is offered in the following sizes: 00, 0, 2, 4, 6, 8, 10, 12.