Anyone else still thinking about Keira Knightley's backless green dress from Atonement, 13 years later? At the link in bio, our style editor examines why the backless trend became an unlikely Dark Green Backless Short Homecoming Dress PromGirl Emerald 4 The Jovani 09863 Emerald Green Lace Up Back Short Formal Dress 8 Dark Green Beaded Applique Cross Back Mermaid Prom Dress Promfy 100 percent pure Silk Emerald Green Silk Slip Dress: Backless Deep V Neck Gown