Surprise your peers in this formal open-back long prom dress with short sleeves. This elegant evening gown, under $200, is sophisticated with at an affordable price. Prom dresses don't get chicer than this one with beautiful chiffon fabric and a decorative back-knot detail. The high-bateau neckline offers feminine appeal and a stylish contrast to the prominently displayed open back. The twisted-knot design at back rests under the open back on the long prom dress, creating a small v-shaped cut out above the zippered closure. Complementing the simple neckline, modest short sleeves and a body-hugging fit on the formal dress pull together the entire look.