A chic corset-style bodice makes this long formal prom dress a unique style for your big event. With corset stays wrapping around the waist, this cowl-neck long formal dress gets a fitted look, while thin shoulder straps attach to thin bands that lace up over the open back. The corset-back evening gown has side ruching that tops the thigh-high slit on the long skirt that flows to the floor with a flourish. Offered in misses and some plus sizes, this richly-designed long formal prom dress is surprisingly affordable, at under $200.