For a casually classic look, reach for a tan trenchcoat and a crew-neck t-shirt — these two pieces play really well together. And if you wish to instantly tone down this ensemble with one item, add a pair of black canvas sandals to the equation. As you can see here, it's super easy to look sharp and stay comfortable when chillier weather hits, all thanks to getups like this. This combo illustrates how 20-somethings wow in the fashion department.