All of Keira Knightley's outfits in Atonement (2007) Keira Knightley Same Style Green Vintage Evening Dress in Movie Atonement, Green S The green dress which Keira Knightley wore in Atonement (2007) has been named "the best of all time" by InStyle Magazine, exceeding some classics as Audrey Hepburn's little black dress in Breakfast The Story Behind Keira Knightley's Emerald Green Slip Dress From 'Atonement' British Vogue She walked into the room, and time held its breath. Keira Knightley's emerald silk in Atonement (2007) wasn't just a costumeit was cinematic seduction. Named the best movie dress of all