We love how this combination of a blue suit and a grey sweater vest immediately makes men look sophisticated and sharp. When this look is too much, tone it down by rocking brown leather derby shoes. As you can see here, this look is a really nice pick, especially for summer-to-fall weather, when the mercury is dipping. As you're progressing through your late 20s, you probably want to start dressing with more class. If that's the case, combinations like this are a surefire option.