Power dressers take note: Modern political and business leaders are making blue jeans a key part of their wardrobe. Denim can help leaders signal their "willingness to roll up the sleeves and dig in," writes Christina Binkley. Still, she warns, there are plenty of don'ts for wearing jeans in the workplace: no boot cuts, no acid rinses, and -- above all -- no fancy French-cuffed shirts.

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