The Story Behind Keira Knightley's Emerald Green Slip Dress From 'Atonement' British Vogue 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 10 best dresses in movie history The Courier Mail Keira Knightley Source on Instagram: I've always found these dresses quite similar, but the green dress from 'Atonement' will forever be my favorite. Which one do you Keira Knightley Green Vintage Evening Dress in Movie Atonement Celebrity Dress TheCelebrityDresses