What exactly is a shirt jacket? Is it literally a shirt that's also a jacket? How does that work? And why do I need a mash-up of the two? If you're asking yourself any of these questions, we have some info to share with you.

Is it a little too warm out for a thick jacket, but still cool enough that you feel a bit of a chill? Then it’s perfect weather for shirt jacket, combining the style and function of a good-looking shirt with the utility and warmth of a light coat. Welcome to the chic (and surprisingly practical) world of the shirt jacket. Here are five great selections to get you started.