One-Shoulder Cut-Out Long Prom Dress: Atria 6555HSimply captivating, this one shoulder long prom dress 6555H is more than a dress, it's a story waiting to be told. Curve hugging from the asymmetrical neckline to the hem, this one shoulder long formal dress has a slash style front cut out that adds a sexy vibe for prom, galas, and other black tie events. Offered in misses and some plus sizes, this logn dance dress smooths over the hips before opening in a side slit and flowing into a small train.