For a look that's truly GQ-worthy, choose a white and navy dress shirt and light blue jeans. Feeling inventive? Shake things up by wearing a pair of boat shoes. As you can see, it's extremely easy to look amazing and stay comfy when colder weather arrives, thanks to this getup. As a 30-year-old gent, you want to start dressing like an adult man. In this case, combos like this are ideal as inspiration.