So unique, this mermaid silhouette Rachel Allan 7521 prom dress stuns with waist cutouts, a criss-cross wrap bodice, and tulle ruffled skirt. This look hugs your shape with princess seams as the skirt flares into a layers of ruffles. Embellishments at the waist add a touch of glitz. The back is open from the waist up with two kissing straps. Flaring from just above the knee, the skirt ends with a slight sweep train.