Cold-weather running gear can be expensive, and your old sweatshirt is equally as warm.Sweatshirts and sweatpants have been my go-to running gear this winter.There are plenty of affordable sweats to keep you warm and cozy while running.Running in the cold isn’t for me. I like the cold in my civilian life because I get to layer chunky sweaters with big jackets and really dress up, but it tightens my chest and makes me sniffly when logging miles. The back-to-back blizzards in NYC have had me cycling through cold-weather gear, but instead of relying on jackets, my go-to has been an assortment of crewneck sweatshirts and sweatpants. Even in below-freezing temps, I find them to be the ideal kit for making it through my winter runs.An All-Time Favorite that Won't ShrinkChampion Reverse Weave Crewneck Sweatshirt$60AmazonIt’s not a far-fetched idea. Despite their laze-and-leisure reputation, sweats were first created for running, stretching, exercising with ease and freedom of movement.…