Every winter we anxiously await the arrival of the season's coziest accessories and the inspiring ways celebs wear them. While a staple pair of gloves and a chunky scarf are closet necessities, today we shift the spotlight to the upper region of your ensemble: the cold weather hat! From a colorful knit cap to a luxe cossack, check out our top picks and see a few ways to style them courtesy of stylish stars like Sienna Miller and Rachel McAdams!