We love the way this combo of a white and navy vertical striped dress shirt and a dark green overcoat instantly makes a man look polished and sharp. Rev up the dressiness of this outfit a bit by sporting black leather oxford shoes. This combo is a viable option when it comes to a stylish summer-to-fall transition look. As you go into your 30s, you probably want to start dressing with more sophistication. In this case, ensembles like this are ideal as inspiration.