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 The Symbolism & Appeal Of Green Dresses: Trend History 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 in Atonement. This dress, always, henceforth and forevermore, amen. 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 Hepburns little black dress in Breakfast at