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Week after week, contestants on "American Idol" face scrutiny from judges Simon Cowell, Paula Abdul, Randy Jackson and Kara DioGuardi, not only for their song choices and performances, but also for their outfits.

It's no wonder: the right wardrobe choices have been instrumental in the success of past "Idols," like Carrie Underwood, who went from girl-next-door to red-carpet stunner after undergoing a post-'Idol' makeover.

"She looks very Hollywood and glamorous, but not so chic that she turns off her fan base," says InStyle's fashion director Hal Rubenstein of Underwood. Read full article »

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