If you're facing a sartorial situation where comfort is top priority, this combo of a navy harrington jacket and a black crew-neck t-shirt is always a winner. Let your expert styling truly shine by rounding off this outfit with dark green canvas slip-on sneakers. This combo is a nice pick if you're scouting for a cool summer-to-fall outfit. When it comes to casual clothing for 20-year-old guys, this outfit looks nice on most gents.