For a casual outfit, consider teaming a blue denim jacket with grey plaid chinos — these two pieces fit perfectly well together. To give your ensemble a classier feel, add a pair of black leather derby shoes to this look. There are a variety of ways to look cool and live through the heatwave, and this here is one of them. Ideal to tell the world that even as a 20-year-old gentleman you're confident enough to make your own sartorial choices.