One-Shoulder Long Mermaid Prom Dress: Atria 6713HSlip into this one shoulder long sweetheart prom dress 6713H and stand out with confidence. A contemporary choice for prom, galas, and other formal events, this elegant long evening gown has a sweetheart bodice with a one shoulder diagonal sash. Offered in misses and some plus sizes, this beautiful long formal dress includes a long mermaid skirt that smooths over the hips before opening in a side slit. A small train finishes the look of this one