Teaming a shirt jacket with a sweatshirt is an on-point pick for an effortlessly sleek outfit. For something more on the cool and laid-back end to finish off this getup, complement your ensemble with a pair of white and navy low top sneakers. When it's one of those dull fall days, what better to spice it up than a seriously stylish look like this one? This combo illustrates how to keep killing in the casual fashion department as a mature guy.