A denim shirt and dress pants are among the foundations of any good wardrobe. Serve a little mix-and-match magic by finishing with a pair of dark brown leather casual boots. In the colder months, when warmth is paramount, it can be easy to settle for a less-than-stylish getup. This getup, however, proves that you totally can stay cozy and remain stylish at the same time during the colder months. You can take inspiration from combinations like this if you're making it through your mid-20s and you want to take a more serious approach to your style.