Oscar style preview

Strapless: Keira Knightley wears a Valentino dress at this year's Golden Globes.   Mark J. Terrill / AP

Now that the Oscar field is finally set, Hollywood's most nail-biting, nerve-racking fashion exercise can officially begin.

Of course, the dance between designers and stars lasts until the final hours before the Academy Awards, which means it's too early to say for sure who will wear what on the big night. But there are plenty of clues to be found in recent red carpet appearances by this year's contenders and presenters.

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