This combination of a yellow linen shirt jacket and white chinos comes in handy when you need to look casually elegant in a flash. Our favorite of a ton of ways to complete this outfit is brown leather loafers. This getup isn't a hard one to nail and it's summer-appropriate, which is most important when it's boiling hot outside. As a 30-something man, you want to start dressing like a grown man. If that's the case, looks like this are a surefire option.