This polished combo of a navy denim jacket and dress pants will prove your sartorial prowess. Let your styling chops truly shine by rounding off this ensemble with a pair of dark green derby shoes. A neat ensemble like this one is just what you need come baking hot sunny days. As a 30-year-old guy, you probably want to start dressing like an adult man. If that's the case, getups like this become a great source of inspiration.