Teaming a black long sleeve shirt with navy chinos is an on-point option for a casual but dapper getup. If you're hesitant about how to finish, add desert boots to the mix. During the colder months, when warmth is top priority, it can be easy to surrender to a less-than-stylish outfit in the name of convenience. This outfit, however, is a striking example that you can actually stay comfortable and remain equally stylish during the colder months. Definitely a foolproof option if we're talking fashion for 20-year-old men.