Contour the curves in this open-back long halter prom dress 41012 from Jovani. So sexy from the plunging v-neckline to the hem, this long designer dress features a corset that wraps around to the open back. The long halter formal dress has shoulder straps that attach at the back of the neck, while the hip-hugging long skirt has a thigh-high side slit and a small train. Offered in misses and some plus sizes, this open-back long halter prom dress is the epitome of modern glamour.