So, not to be your mom or anything, but it's better to get prepared for winter before you're caught freezing your you-know-what off. That means taking full inventory of your wardrobe and making sure you're checking all the boxes of winter dressing — namely: warmth, warmth, and more warmth. Eventually, you'll have to swap out your trench coat for a puffer, your sheer socks for some thicker ones, and the rest of your closet for, well, Heattech everything. And when that time comes, you'll be ready. Here's everything you need for the first day that drops below freezing.