The Story Behind Keira Knightley's Emerald Green Slip Dress From 'Atonement' Vogue Keira Knightleys green dress in Atonement , To assemble the wardrobe of the characters, director Joe Wright called on Jacqueline Durran with whom he had worked on the mythical film, Pride and The aesthetics of Atonement , The green dress which Keira Knightley wore in this movie has been named the best of all time by InStyle Magazine, exceeding some classics as Audrey Hepburns little Keira Knightley wearing a green dress created by costume designer Jacqueline Durran in the 2007 film 'Atonement' : r whatthefrockk