Go for a simple yet laid-back and cool choice teaming a charcoal crew-neck t-shirt and dark green chinos. Brown suede derby shoes are a guaranteed way to inject a hint of refinement into your look. No doubt, it's easier to work through a roasting hot day in a easy and breezy getup such as this one. As you're going through your late 20s, you probably want to start dressing maturely. In this case, getups like this become very relevant.