Choose a beige blazer and navy chinos and you'll don a neat and refined look. Play up the classiness of your outfit a bit by finishing off with a pair of brown leather double monks. You'll always look stylish even despite the unbearable heat if you have this outfit as your go-to formula. As a 30-year-old gentleman, you probably want to start dressing more like a mature gentleman. If that's the case, ensembles like this prove useful as a source of inspo.