Here's a mermaid formal prom dress that's fun and sassy. Supported by an illusion inset, the plunging v-neckline on this long prom dress pairs up with the v-shaped open back to create a visually slenderizing effect. Embellished embroidery trails down from the wide straps through the hips in an exquisitely intricate pattern. The layered tulle skirt that flares out from the knees of this tight v-neck prom dress add a dash of whimsy to the flirty style. For a beautiful, chic look, wear this open-back embroidered mermaid prom dress.