For an ensemble that's street-style-worthy and effortlessly smart, try teaming a light blue trenchcoat with khaki chinos. Add black chunky leather loafers to your look to instantly step up the style factor of your look. As you can see, it's extremely easy to look amazing and stay toasty come fall, thanks to this look. If you're wondering how you should dress as a 30-year-old gentleman, this combination is a good source of inspiration.