The changing seasons and falling leaves are a great time to ponder life's great questions.
"Is it a shirt or is it a jacket?" is not one of those great questions.
But still, the beguiling overshirt, shirt jacket or shacket, if you're into portmanteaus, should be a go-to option for staying just the right amount of warm throughout fall and winter.
These are 10 shirt jackets for your consideration. Wear them, layer them, love them.
This rugged Shop Shirt is made from a performance hemp blend and is stonewashed for a broken-in look and feel from day one. Pair it with some dark denim, and wear it to work, to rake leaves or teach a shop class. The two front patch pockets are a fine focal point, and the button-flaps will keep your phone or flask tucked securely against your person. Taylor Stitch, $168
This cotton shirt jacket from Untuckit is lined with flannel and super soft. It's thick enough to keep you warm but thin enough to layer, so you can float through life (or at least your day) in total comfort. Untuckit, $148
This tri-thermal overshirt has a mélange sweater knit face with a velour fleece back that delivers plenty of warmth without weighing you down. The yoke, cuff and chest pocket are lined with 100% organic cotton, and the outer shell is made from densely knitted yarn and features metal snaps—in case you need to unbutton in a hurry. prAna, $129
Merge some autumnal plaid with a name like Blanket Shirt, and you just know you're going to be cozier than the next guy. The best part: You can choose from 30 (!) different styles. Outerknown, $148
Reach for this cotton-cashmere blend for warmth and comfort all day long. Throw it over a button-down, and you'll look better than you have to. Peter Millar, $225
Step 1) Put on this sherpa overshirt with a quilted nylon interior. Step 2) Try not to rub your hands up and down your upper half while quietly whispering, "Gosh that's soft." Marine Layer, $165
Here's a quilted wax canvas shirt jacket that will never go out of style. It's tough, versatile and ready for anything. Flint and Tinder, $258
With a rugged cotton suede exterior and soft, flannel-lined interior, it's a real business on the outside, party on the inside situation. Legendary Whitetails, $80
Filson makes more than just great duffels. They also make shirts, including this heavyweight fleece-lined number that's engineered to protect you from the elements. Filson, $185
This boiled wool chore coat is part shirt, part jacket and part sweater. That's the kind of three-in-one value you can really appreciate as the temperatures drop. Madewell, $185