So sexy, this open-back long satin prom dress shows off the curves like crazy. Crafted in gleaming satin from the straight neckline to the hem, this open-back long formal dress smooths over the bodice before an eye-catching front-knot detail commands attention at the hip. Thin shoulder straps create a statement as they lace up over the open back of this gorgeous long satin evening gown, while the hip-skimming long skirt ends the style with a thigh-high side slit. Offered in misses and some plus sizes, this beautiful long satin prom dress is surprisingly budget friendly, at under $100.