This casual combo of a white and black shirt jacket and a crew-neck t-shirt is very easy to throw together without a second thought, helping you look awesome and prepared for anything without spending too much time searching through your closet. Bump up your getup by rocking brown suede chelsea boots. As you can imagine, this is a kick-ass option when warmer days are here. A good illustration for anyone who wonders how to dress as a 20-something guy.