Here's a gorgeous long a-line prom dress that offers a traditional look with sexy details. The beautiful long designer dress by La Femme has a fitted bodice with an empire waist and thin shoulder straps that criss cross the open back before tying into a trendy corset detail. A wide band wraps around the waist to the back of this long evening gown, while the figure-flattering long a-line skirt opens in a side slit before cascading to a dramatic floor length. Defining femininity for prom, galas, and other formal events, this long a-line prom dress by La Femme is a luxurious choice for your big night.