This pairing of a trenchcoat and a sweater vest is seriously dapper and creates instant appeal. Introduce white leather derby shoes to the mix and the whole ensemble will come together. So as you can see, this getup is a really savvy choice, especially for summer-to-fall weather, when the temperatures are falling. If you're in your late 20s, take cues from ensembles like this to take a more adult approach to your personal style.