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 The Story Behind Keira Knightley's Emerald Green Slip Dress From 'Atonement' British Vogue The Story Behind Keira Knightley's Emerald Green Slip Dress From 'Atonement' Vogue Obsession in Green The Atonement Dress Closet Core Patterns Atonement dress, Keira Knightley, Green Dress UK Velvet Birdcage