Best Bet: Madewell’s Cadet Cardigan

Cozier than a blazer but inspired by the peacoat, this lambswool cardigan makes a versatile layering piece for punishingly cold weather. The gold buttons and the notched lapels give it a slightly dressier look than your typical slouchy boyfriend cardigan. Wear it open over short sleeved tops and tanks to work, then pair it with jeans for weekend brunch. Though "olive grove" isn't the easiest hue to pull off, the knit also comes in a more wardrobe-friendly shade of navy.

Cadet cardigan, $110 at Madewell or online.