This combo of a navy and white long sleeve t-shirt and dress pants is a must-try effortlessly smart getup for any modern gentleman. A pair of black leather casual boots will add a new flavor to an otherwise all-too-safe outfit. It's a viable pick if you're figuring out a killer look for unpredictable fall weather. As a guy in his thirties, you want to start dressing like a grown-up. That's when combinations like this become a great source of inspiration.