It might not feel like it yet, but each region is about to slowly descend into that brief transitional window between sunburns and frostbite, where Pumpkin Spice overcomes spiked seltzer.

We'll welcome the crunchy leaves, darker colors and dive back into our closets to rediscover our old winter favorites. But, before hibernating, it's best to take advantage of this autumnal opportunity and embrace a versatile piece of outerwear that's only gotten more popular over the past few years.

A shirt jacket is pretty much exactly what it sounds like: a shirt, meant to be worn as a jacket. Congrats, you've mastered it. Before sliding into the down and fleece, the shirt jacket is the perfect piece of outerwear to throw on, hang up and recycle over and over again like a grocery tote. The more traditional styles are going to be in natural colors, and baggy enough to layer over a button down, thick T-shirt or light sweater. Similar to a blazer, if a shirt jacket has a lot going on, it's going to look better over a plain shirt, and the more subtle ones can layer over those eye-popping tees that aren't ready to get displaced over winter.