Square-Neck Long Prom Dress: Atria 6704HElevate your allure in this open back long prom dress 6704H from Atria Couture. With a simple square neckline, this elegant long formal dress gets a sexy vibe with thin shoulder straps that criss cross the open back before lacing up for the best fit. Offered in misses and some plus sizes, this long evening gown has a hip skimming long mermaid skirt with a thigh high side slit and small train that follows behind. So chic for prom, galas, and other