For an outfit that's super simple but can be manipulated in plenty of different ways, rock a green print short sleeve shirt with chinos. Want to break out of the mold? Then why not add a pair of brown derby shoes to the mix? As we all know, the trick to getting through the hottest time of year is wearing cool outfits like this one. Those who wonder how to pull off modern casual dressing as you progress through your 20s, this outfit should answer your question.