For a laid-back outfit, consider pairing an olive floral short sleeve shirt with navy chinos — these pieces go nicely together. If you're wondering how to finish off, a pair of black canvas slip-on sneakers is a surefire option. There are a multitude of ways to look killer and live through the blazing hot weather, and that's one of them. And if we're talking casual outfit ideas for teens, this combination looks great on most men.