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 City Studios Juniors' Embellished Strap Bow Back Dress Macy's Open Back Satin Bow Dress in White SENI & CADE Juniors' Low Back Bow Detail Shift Dress Macy's So freaking iconic , 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 YAS deep V bow back mini dress in white ASOS