Greg from Arizona is one of my favorite hot weather dressers. Here he’s wearing tropical-weight patterned wool trousers, which he’s balancing with a dark blue sport coat and plain white shirt. I’m presuming that that coat doesn’t have a full lining. Unless you’ll be outside for a long stretch of time, a lightweight coat will often keep you cooler than short sleeves, by keeping your flesh out of the sun. Tropical-weight wool also wears surprisingly cool. Of course, since most of us spend most hot days in a climate-controlled environment, covering your arms and legs serves the secondary purpose of keeping the AC chill off the skin.