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 Atonement: Keira Knightley's Green Dress Clothes on film The Story Behind Keira Knightley's Emerald Green Slip Dress From 'Atonement' Vogue The Story Behind Keira Knightley's Emerald Green Slip Dress From 'Atonement' British Vogue 10 best dresses in movie history The Courier Mail Keira Knightleys emerald green dress in Atonement (2007) has become one of the most iconic costumes in film history. Designed by Jacqueline Durran, the silk gown perfectly captured 1930s elegance