Rachel Allan 70778 stretch taffeta, beading prom dresses are offered in Black, Pink, Royal. $538 is the Formal Approach best price guarantee for style 70778 by Rachel Allan. Shop with confidence, Formal Approach is an authorized Rachel Allan prom dress store. Rachel Allan 70778 is offered in the following sizes: 00, 0, 2, 4, 6, 8, 10, 12.