You'll look confident and feminine in any of these stunning blue formal and blue cocktail dresses from Simply Dresses. This selection of designer dresses in blue includes many styles from sexy beaded blue cocktail dresses, to long blue halter top prom dresses, and short ball gowns in blue. Baby blue, turquoise, aqua, or navy. We have long and short formal dresses, evening gowns and cocktail dresses in almost every shade of blue you can imagine. An elegant blue evening dress for your homecoming, bridesmaids, formal, or cocktail party is only a click away.