Atonement [1] costume designer Jacqueline Durran chose emerald green for Keira Knightley's character because to her, the hue symbolizes temptation. She certainly found the perfect color (which was a mixture of lime green silk, black and green organza, and green chiffon) because the dress is loved by nearly every girl who has seen the flick. Lucky for us, there's a look for less!

To see the less expensive version,

Faviana's Celebrity-Inspired Green Gown [2] ($238) is nearly an identical copy of Keira's version. But unlike the actress' dress, it's not as low-cut, which is a good thing considering it would be hard to wear in real life. Should it sell out, visit Faviana's website [3] for more info.

Source [4]