DESIGN house Faviana has competitors green with envy over its "must-have" Keira Knightley emerald-green gown from her new film, "Atonement." The couture dress, which cost tens of thousands of dollars to create, was highlighted last week in The Post's Pulse section. Then Knightley won a Golden Globe nomination for Best Actress. So now the designers at Faviana are banking on selling thousands of knockoffs of the 1930s-inspired gown, to be in stores mid-January priced at $238.

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