Strappy Open Back Long Prom Gown: Amoris T714 Bungalow Hartl Elegance 136 W New Life Blaue Lagune. Check out this romantic cowl neck long prom dress T714 from Amoris by Cinderella Divine. With a dramatic cowl neck bodice, this beautiful long a line formal dress gets a sexy vibe with thin shoulder straps that criss cross the open back. In misses and some plus sizes, this elegant long evening gown has a long a line skirt that flows to the floor for a figure flattering look at prom, galas, and other formal events. Budget priced well below $150, this cowl neck long prom dress is a stunning blend of modern elegance and affordability.