Demonstrate that nobody does smart men's fashion quite like you do in a dark brown double breasted blazer and a light blue polo. Add dark brown leather tassel loafers to the equation for an added dose of sophistication. This combo isn't a hard one to create and it's summer-appropriate, which is more important when it's super hot outside. As a 30-something gentleman, you probably want to start dressing more like a mature gentleman. In this case, ensembles like this come in very useful.