Movie Atonement Cecilia Tallis Cosplay Costume Green Evening Dress Girls Skirt Halloween Carnival Party Ball Gown for Women Fruugo UK The Story Behind Keira Knightley's Emerald Green Slip Dress From 'Atonement' Vogue a perfect green dress moment Kiera Knightley's green dress in Atonement (2008) is now known to be one of the best green dresses in cinema and a symbol of the love story. Its length was critical and Keira Knightley's unforgettable green dress in Atonement was custom designed by costume designer Jacqueline Durran, created specifically for the film rather than by a fashion house. Inspired by 1930s bias cut evening gowns, the