INDIA, Dec. 9 -- When I landed in New York City's JFK airport from my trip to the Dominican Republic this November, I was in for a surprise. Once I stepped outside, I saw that it was snowing-which gave me quite the temperature shock, considering I had been on a balmy Caribbean island just hours beforehand. Seeing snow this early in the year signaled to me that it was time to prepare my wardrobe for what's sure to be a really cold winter.

If you, too, need to prep your closet for icy temperatures quickly, an easy way to do it is by stepping your layers up. One item your winter wardrobe can't go without is a pair of fleece-lined leggings. Whether you're traveling, running, hiking, or simply lounging at home, they're a great way to keep yo...