Mermaid V collar off shoulder sleeveless backless and floor length evening dressSo sophisticated, this classic one shoulder long prom dress allows you to step into a world or romance and style. Simply gorgeous for prom, galas, and other black tie events, this long formal dress has one shoulder strap that splits into two thinner ones that flow diagonally over the open back. In misses and some plus sizes, this beautiful long evening gown has a long a line skirt that flows to the floor in an a line shape.