Exclusively sold at PromGirl, this taffeta mermaid prom dress radiates Old Hollywood vibes with modern flair. Topping the structured corset bodice of this long strapless prom dress, lace embellishments form the curve of the sweetheart neckline above a swoop of flattering pleated fabric along the bustline. Fitted down to the knees, this corset prom dress then flares out to end in a horsehair hemline that helps to hold the floor-length skirt's iconic shape. Polishing off this taffeta mermaid prom dress, a train is the perfect ending to this celeb-worthy design.