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 The Catwalk Italia TCI on Instagram: "Most iconic green dress in a movie: 1,2,3, Summer Wind: Green Gown Atonement' 10th anniversary: The inside story on that iconic green dress 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