Every guy should own a solid parka jacket. If not for the jacket's stylish benefits, then cop for its functionality and performance in the elements. Parkas are normally roomy jackets, which means you can layer a bunch underneath them, but they're usually warm enough that they don't need too much work. Essentially, whatever you want to wear that day—sweatshirt, baseball jersey, longsleeve T-shirt, button-up shirt, whatever—will all fit under your parka and you'll still be warm.