So sophisticated, this classic one-shoulder long prom dress 7450 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. Surprisingly affordable, at under $150, this one-shoulder long prom dress embraces contemporary elegance without breaking the bank.