The Story Behind Keira Knightley's Emerald Green Slip Dress From 'Atonement' British Vogue 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 Keira Knightley's green dress in Atonement isn't just stunning it's a storytelling tool. Designed to reflect her character's innocence, desire, and tragic fate, the dress uses color and silhouette to deepen Ian McEwan on putting Atonement on stage: 'My wife invented the green dress' Sweetheart Emerald Green Tulle A line Midi Dress Ohmollydress Amazon.com: Glittery Tulle Empire Waist Special Occasion Dresses for Women Spring Ball Gowns Formal Emerald Green 2: Clothing, Shoes & Jewelry