Our Black Silk Backless Plunge Dress. Silk bodice, thin straps, low neckline, and zip closure at the back. Available online and through select retailers worldwide. A Line Open Back Navy Blue Satin Long Prom Dresses with High Slit, Long Navy Blue Formal Graduation Evening Dresses SP2983 Solid Color Navy Blue Open Back Fishtail Hem Bodycon Prom Dresses Serenity Majestic Black Strapless Silk Satin Maxi Dress Cult Mia Assymetric Satin Maxi Dress with Bow and An Open Back 42 (FR) Black