For a look that's very simple but can be dressed up or down in a great deal of different ways, try teaming a navy short sleeve shirt with khaki dress pants. And if you want to instantly lift up this look with shoes, complement your outfit with a pair of brown leather tassel loafers. As a 30-something gentleman, you're sure to appreciate this ensemble.
As you can see here, looking casually classic doesn't take that much effort. Just consider teaming a navy short sleeve shirt with khaki dress pants and you'll look awesome. Want to dial it up in the shoe department? Introduce brown leather tassel loafers to the equation. That's the look for a 30-year-old gentleman to convey he has what it takes to succeed.