Marrying a brown shearling coat and navy jeans will hallmark your expertise in men's fashion even on off-duty days. Casual boots are an effective way to give a sense of sophistication to your getup. During winter, when functionality is above all, it can be easy to surrender to a less-than-stylish getup. But this getup is a striking illustration that you can actually stay comfortable and remain equally stylish in winter. Overall, a good demonstration of laid-back fashion for gents in their 30s.