For an outfit that's super straightforward but can be manipulated in a variety of different ways, dress in a blue gilet and a turtleneck. If in doubt as to what to wear when it comes to shoes, go with a pair of dark brown suede casual boots. During winter, when warmth is everything, it can be easy to surrender to a less-than-stylish getup in the name of functionality. However, this getup is a clear example that you totally can stay comfortable and remain stylish at the same time during winter. Casual combinations for 30-year-old gentlemen aren't actually that hard, as you can see here.