Make a white shirt jacket and beige chinos your outfit choice to pull together an interesting and modern-looking relaxed casual ensemble. And if you wish to easily dress down your ensemble with a pair of shoes, why not complete this outfit with brown leather sandals? This look isn't a hard one to nail and it's summer-ready, which is more important when it's boiling hot outside. This getup illustrates how gentlemen in their 30s wow in the fashion department.