Keira Knightley wears two different dresses in one at London Film Festival, we likey OK! Magazine A dress so iconic the original went missing! Keira Knightley's emerald silk gown in Atonement wasn't just the green dress it was the moment. Custom dyed, cut on the bias, and Netflix 'The Woman in Cabin 10': Where to Get Keira Knightley's Outfits as Laura 'Lo' Blacklock Femestella 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 Joins Co Stars Ben Whishaw & Sarah Lancashire at 'Black Doves' Premiere in London: Photo 5103159 Adam Silver, Andrew Koji, Ben Whishaw, Black Doves, Ella Lily Hyland, Isabella Wei, Kathryn British Actress Keira Knightley arrives 04 September 2007 for the UK News Photo Getty Images