This pairing of a navy sweater vest and black jeans is really a statement-maker. As for footwear, complement your outfit with tan suede casual boots. During the colder months, when warmth is the priority, it can be easy to settle for a less-than-stylish getup. However, this getup proves that you totally can stay warm and remain stylish during the colder months. Now that's an outfit any guy in his thirties will love.