A grey suit and a black crew-neck t-shirt teamed together are the ideal look for gents who appreciate refined styles. To bring some extra fanciness to your ensemble, add a pair of brown leather brogues to the equation. Totally appropriate for summertime afternoons, you can wear this ensemble all summer long. As you're going from your 20s to your 30s, you want to start dressing maturely. In this case, outfits like this become a great source of inspiration.