For a casually stylish getup, pair a cardigan with a white and blue dress shirt — these two pieces play really well together. For a more elegant spin, complete this look with a pair of dark brown leather dress boots. During winter, when comfort is the priority, it can be easy to settle for a less-than-stylish ensemble in the name of convenience. However, this ensemble is a shining example that you totally can stay cozy and remain equally stylish in winter. Certainly a nice option if we're talking outfit ideas for 20-year-old guys.