The emerald green silk dress Keira Knightley wears in Atonement became a cinematic legend not just for its beauty but for the intention behind it. Costume designer Jacqueline Durran created it to feel Atonement: Keira Knightley's Green Dress Clothes on film Keira Knightley Green Vintage Evening Dress in Movie Atonement Atonement dress green wedding dress Long maxi dress with open back Backless, Cecilia in Atonement, green dress Keira Knightley Keira Knightley Same Style Green Vintage Evening Dress in Movie Atonement, Green S 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