Here's a sparkly long mermaid prom dress that is sure to shine for your celebration. Iridescent sequins swirl over this shimmering long formal dress from the plunging v-neckline to the hem of the curve-hugging long mermaid skirt for a fabulous look at prom, galas, and other formal events. In misses and some plus sizes, this exciting evening gown has a beaded waistband and thin shoulder straps that lead to the corset-style lace-up back. Soft ruffles flow vertically from the knees to the floor to complete the look of this long mermaid prom dress that is surprisingly affordable, at under $200.