A mustard puffer jacket and chinos are the kind of a fail-safe outfit that you need when you have no time. Inject a more casual finish into your ensemble by wearing black print leather low top sneakers. So as you can see, this ensemble is a really smart idea, especially for summer-to-fall weather, when the temperatures are dropping. So if you're hunting for a nice and mature outfit for a guy in his 20s, this is it.