Rachel Allan 40507 taffeta prom dresses are offered in Black, Lime, Royal, Tangerine, Ultraviolet. $298 is the Formal Approach best price guarantee for style 40507 by Rachel Allan. Shop with confidence, Formal Approach is an authorized Rachel Allan prom dress store. Rachel Allan 40507 is offered in the following sizes: 00, 0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24.