Teaming a beige polo with dress pants is a good option for a casually stylish look. To give your overall look a sleeker feel, why not add a pair of dark brown leather derby shoes to the mix? No doubt, it's easier to work through a warm day in a easy and breezy getup like this. As you're moving from your 20s to your 30s, you want to start dressing maturely. If that's the case, combinations like this are a foolproof option.