A brown short sleeve shirt and navy jeans are a combo that every dapper gent should have in his casual arsenal. And if you wish to immediately dial down your look with a pair of shoes, why not complete your look with tan leather sandals? Naturally, it's easier to work through a blazing hot summer day in a light and breezy ensemble such as this one. This combo demonstrates that approaching your 30s is no reason to stop dressing casually.