Anyone else still thinking about Keira Knightley's backless green dress from Atonement, 13 years later? At the link in bio, our style editor examines why the backless trend became an unlikely Keira Knightley on working with costume designer Jacqueline Durran on her trifecta films 'Pride & Prejudice,' 'Atonement,' and 'Anna Karenina' 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 A Tone of Green Polka Dot Wedding