Hair Look of the Day

THE STYLE Big, voluminous waves parted on the side and structured throughout 

WHERE The Late Show with David Letterman in New York City

WHY WE LOVE IT Highly coiffed waves might only seem doable for your '40s-themed Halloween party, but Kim Kardashian made them day-appropriate. To follow her lead, keep curls in place with just a touch of hairspray—gumming them up with loads of product can make them look stiff.