A white hoodie and a white crew-neck t-shirt are among the key pieces in any modern gentleman's well-coordinated off-duty sartorial arsenal. A cool pair of white leather low top sneakers ties this look together. When it comes to dressing for autumn, nothing beats a knockout outfit that will keep you toasty and looking your best. This combination should erase any doubts you had about wearing classier clothes as a 20-year-old man.