We're all for killing two birds with one stone, so we're expecially psyched that it's shirt jacket season again. Yup, that's right—a shirt jacket is exactly what it sounds like. Just don't call it a shacket. This great transitional piece for fall is perfect for looking stylish in-between seasons. It looks like a shirt with the details of a button-down, but functions like a jacket adding warmth where and when you need it. Click through our list of The Best Shirt Jackets Available Now, and be prepared to look better than everyone else.