One-Shoulder Long Mermaid Prom Dress: Atria 6568HTruly sophisticated, this one shoulder long mermaid prom dress 6568H is a testament to the modern woman. Tight fitting from the asymmetrical neckline to the hem, this elegant long formal dress from Atria Couture has diagonal criss cross ruched bands over the waist. In misses and some plus sizes, this gorgeous one shoulder long dance dress has a slinky long mermaid skirt that flows to the floor in a horsehair hemline, while a small train trails behind.