Why not consider teaming a burgundy cardigan with a white tank? As well as totally practical, these two pieces look amazing matched together. Bump up the formality of your outfit a bit by slipping into a pair of black leather tassel loafers. A great example of transeasonal fashion, this getup is a staple when spring arrives. This combo illustrates how to keep killing in the casual style department as a 30-something Millennial gentleman.