A good sweatshirt is a must in every man's wardrobe. This medium weight loop back jersey sweatshirt from Merz b. Schwanen is really that essential piece that you should have. Casual looks with jeans, or sporting with your sweater as the only top layer - try it, that's what they were originally made for! Modern conoisseurs will casually use a button-down and jeans with a sweatshirt.