A white knit wool turtleneck and navy jeans are a combo that every sartorially savvy gent should have in his off-duty arsenal. Finishing off with a pair of dark brown leather dress boots is a fail-safe way to bring a sense of refinement to your getup. When the cold season leaves you uninspired in the fashion department, this getup just might fix the problem. As you get into your 30s, you want to start dressing more professionally. In this case, combinations like this are ideal as inspiration.