Ruffle Mermaid Prom Dress: PromGirl Exclusive 250069Girl and fun, this strapless ruffled mermaid prom dress is exclusively sold at PromGirl. Contouring the curves from the sweetheart neckline through the hips, this long corset prom dress features an adjustable lace up detail over the open back for a customizable, snug fit. Figure flattering pleats slant across from one side of the floor length skirt down to the cascading ruffled tiers. Making it easy to move in this open back mermaid prom dress, a slit