A black blazer and a grey crew-neck t-shirt are absolute menswear essentials if you're putting together an off-duty closet that matches up to the highest sartorial standards. Brown leather casual boots are a fail-safe footwear style that's also full of personality. In the colder months, when comfort is paramount, it can be easy to settle for a less-than-stylish outfit. This outfit, however, is a clear example that you can actually stay warm and remain stylish in the colder months. As a 30-something gent, you probably want to start dressing more maturely. That's when combos like this come in very handy.