Keira Knightley as Cecelia Tallis in Atonement (2007)
The greatest movie costume of all time? That seems a precipitous judgment for a movie that came out a few months before the voting. But there's no question that Knightley's green satin halter gown, gathered and wrapped at the waist and ending in a long train, has a rapturous effect — both on the young man (James McAvoy) who sees her in it and on the movie audience. Jacqueline Durran, who also clothed Knightley in Pride and Prejudice, is the costume designer here.

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