For a look that's worthy of a modern fashionable gent and casually classy, wear a shawl cardigan with a tan blazer. Go ahead and complete this ensemble with a pair of white leather low top sneakers for a more casual finish. It's is a viable choice if you're on the hunt for a kick-ass getup that transitions easily into fall. Gentlemen who are curious how to wear cool off-duty looks in your early 20s, you have your answer.