Front-Knot Long Prom Dress: La Femme 31516Effortlessly beautiful, this long prom dress 31516 from La Femme is a hot pick of the season. With figure flattering knot details at the sweetheart neckline and at the side of the skirt, this long designer dress is sure to make a fashion statement from the moment you make your entrance. The long formal dress has thin shoulder straps that lead to the strappy open back, while the floor length skirt opens in a thigh high side slit for a sexy vibe at