The latest celebrity trend is as stylish on the stage as it is on the sidewalk. But are you daring enough to wear tight, rock-star leggings? All you need is some baby powder and a "lust for life," says the design collective, Les Chiffoniers. Kate Moss saw practical potential in the label's PVC pants—she wore the easy-wipe leggings to this summer's muddy Glastonbury festival. Just don't forget to adopt the model designer's signature joie de vivre. According to Les Chiffoniers: "Shrinking violets, plain Jane super-brains, wallflowers and sideliners," should all skip the style.

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Kate Moss's Les Chiffoniers PVC leggings, $402; at brownsfashion.com.

—Betony Toht