A navy shearling jacket and khaki chinos are the kind of a tested casual ensemble that you so terribly need when you have zero time to dress up. For a more relaxed vibe, complete your outfit with a pair of athletic shoes. In the colder months, when warmth is imperative, it can be easy to settle for a less-than-stylish getup. But this getup is a good illustration that you totally can stay snug and remain stylish at the same time in the colder months. Now that's how you dress casually as a mature man.