Cooling temps can mean only one thing: fall fashion. But with all of the chilly mornings that turn into too-warm afternoons, fall is one of the hardest seasons to dress for weather-wise. This is where our friend layering comes in, and Amazon shoppers have found a transitional weather staple they say is ideal for tossing on or taking off as temps change: the , down to a mere $21 right now.

This shirt/jacket hybrid is substantial enough for chilly fall days, but still lightweight enough to wear in the warmer months. You can bring home (somewhere between a shirt and a jacket, get it?) for just over $21 right now with an on-page coupon — that's nearly 40% off. It comes in 18 colors, ranging from neutrals like black and brown to more vibrant shades including pink and yellow, and they're all on sale (prices may differ).

If you're someone who never leaves home without a cardigan or jean jacket in the fall, this is for you. The shacket is lightweight and can be tossed on over your favorite tee or tank for extra warmth and coverage. But you can also button it up and wear it by itself.

Pair it with a skirt, dress, jeans or leggings. It's also great for cuddling up with on the couch. This design features an oversized fit and one chest pocket for added interest.

The waffle knit texture helps it feel a little more special than your run-of-the-mill cotton button-up, but take note: Some reviewers say the lighter colors are a bit sheer. We love how the jacket borders on baggy, which means .