A grey crew-neck sweater and dark brown chinos are among the key elements in any gentleman's functional off-duty wardrobe. Our favorite of an infinite number of ways to finish this outfit is a pair of black leather chelsea boots. So so as you can see, it's a neat, not to mention spring-appropriate, getup to keep in your transitional closet. Classic and casual combos for guys in their 20s aren't actually that hard, as you see.