For a look that's city-style-worthy and effortlessly smart, consider pairing a beige wool blazer with a beige cardigan. Boost the classiness of your ensemble a bit by finishing off with dark brown suede oxford shoes. So when summer is fading away and fall is taking its place, this look is likely to become your favorite. As a 30-year-old gentleman, you want to start dressing with more refinement. If that's the case, getups like this come in handy.