Breathe an element of relaxed refinement into your current styling routine with a navy suit and a navy crew-neck t-shirt. Puzzled as to how to round off your getup? Rock black leather tassel loafers to dial it up a notch. This look is a good illustration that you don't have to give up style for practicality during the winter season. Combinations like this go a long way towards developing your style as a 30-something Millennial gent.