A long sleeve t-shirt and dark green sweatpants are the kind of a foolproof casual look that you so terribly need when you have zero time. Break up your look with a classier kind of footwear, like this pair of black leather casual boots. So as you can see, it's super easy to look amazing and stay snug when chillier weather comes, all thanks to combos like this one. This outfit illustrates that as a 20-something guy, you have a wide range of dressing options.