A brown duffle coat and charcoal jeans are appropriate for both semi-casual situations and off-duty wear. To add some extra definition to your ensemble, introduce a pair of brown leather brogues to the equation. In the winter months, when warmth is key, it can be easy to surrender to a less-than-stylish outfit in the name of practicality. However, this outfit is a striking example that you totally can stay snug and remain equally stylish during the winter months. A no-brainer getup appropriate for 30-year-old gents.