Whatever you call it—an overshirt, shirt jacket or shacket—now is its time to shine. I don't want it to seem like I'm rushing the season, I know we are approaching fall but it's still plenty warm out. However, between now and the arrival of true autumn weather, we exist in the sweet spot for lightweight outerwear. You know, that annoying phase of cool mornings, blazing hot sun throughout the day, followed by an evening chill. Embrace the shirt jacket and you'll set all day.

Because the temperatures fluctuate so much this time of year, you want something that can be light enough to throw over anything yet substantial enough to provide some actual insulation. I'm always cold, so I've got an overshirt with me year-round, and I'll pull it on with my chinos, or some jeans and a T-shirt, and even with my shorts. It's meant to be the “just in case” piece you throw on if there's the slightest chill. Plus, it has a unique way of finishing any outfit.

There are tons of affordable and investment-worthy overshirts in range of weights, fits and fabrics. You need to decide how cool or warm you run personally, to decide which one would suit you best. We've rounded up some stylish options that can keep you warm and looking cool while in the office or layered for those evening strolls.