This combo of an olive overcoat and a navy long sleeve shirt is definitive proof that a simple getup doesn't have to be boring. For a more laid-back aesthetic, introduce a pair of beige suede casual boots to this look. During the colder months, when functionality is critical, it can be easy to surrender to a less-than-stylish ensemble in the name of functionality. However, this ensemble is hard proof that you can actually stay toasty and remain equally stylish during the colder months. This ensemble demonstrates that as a 20-year-old guy, you have a vast array of sartorial options.