Empire-Waist Backless Long Prom Dress: Atria 6863HA hot pick for the season, this open back tight long prom dress 6863H is a head to toe stunner. Celebrate your timeless beauty and confident style at prom, galas, and other formal events in this long evening gown with a empire waist that offers a long, lean look. In misses and some plus sizes, this long formal dress has thin shoulder straps that lead to the open back, while the hip hugging long skirt has a thigh high side slit and a small train that