For a look that's truly gasp-worthy, consider wearing a blue chambray dress shirt and dark green dress pants. Brown suede oxford shoes complement this ensemble quite nicely. This look is probably exactly what you're looking for as a gent in his 30s.
Blue Chambray Dress Shirt with Brown Suede Oxford Shoes Dressy Warm Weather Outfits In Their 30s
A modern guy's elegant collection should always include such essentials as a blue chambray dress shirt and grey dress pants. A pair of brown suede oxford shoes will pull the whole thing together. After 30, you probably want to start dressing with more class. In this case, inspiration like this comes in useful.