Check out this gorgeous open-back long prom dress by Morgan & Co. The beautiful junior-size long formal dress is a nude-colored frock with vibrant fuchsia sequin flowers from the v-neckline to the hem, The long sequin special-occasion dress has thin shoulder straps that lace up over the open back for the best fit at prom, galas, and other black-tie events. Bright, bold, and beautiful, this open-back long prom dress is surprisingly affordable at under $200.