Enchanting Square Neckline Mermaid Silhouette Dress by Amarra Sizzling and elegant, this beautiful creation from the house of Amarra is an excellent choice for your prom night. Designed with a square neckline, this fitted bodice features trendy spaghetti straps. To ooze out mermaid vibes, the sheath skirt dramatically ends in a mermaid silhouette complemented by a sweep train.