Long Sequined Mermaid Tulle Evening Prom Dress Trumpet V-neck Backless Elegant Wedding Party Gowns Gathered at the natural waistline, the floor-length skirt cradles the curves, showcasing a shapely silhouette before flaring out in mermaid style on this formal evening dress. Up-to-the-minute trends make this mermaid long prom dress uniquely elegant for prom 2019, evening party, homecoming, military ball, formals, or other black-tie events.