There's a stretch of autumn when a T-shirt is too little and a coat is too much. Mornings start cold, afternoons warm up, and whatever you put on at eight is wrong by noon. The overshirt was made for that gap, and this season it's having a moment: chore coats and shackets show up in autumn 2026 menswear forecasts as the casual layer taking over from the topcoat for everyday wear, and search interest in "shacket" has roughly doubled over the past three months.
It's also an easy piece to get slightly wrong. Too thin and it's just a shirt worn open. Too tight and it won't go over anything. Here's how to choose one and wear it well.
Overshirt, shacket, shirt jacket: what's the difference?
Mostly naming. All three describe the same idea: a garment cut like a shirt, with a collar, a button front and chest pockets, in a fabric heavy enough to wear as an outer layer. "Shacket" is the internet's word, "overshirt" the menswear shop's, and "chore jacket" the boxier workwear cousin with patch pockets at the hip.
What separates a real overshirt from a regular shirt worn open is weight and structure. Hold it up by the shoulders. If it drapes and clings, it's a shirt. If it holds its shape and hangs straight, it's an overshirt.
Choose the fabric for the weather
Fabric decides how warm the overshirt is, how dressy it looks and how many months you'll get out of it.
- Twill. The most versatile option and the one to buy first. A tight diagonal weave gives it structure without bulk, so it looks sharp buttoned up and still works open over a tee. The Aspen Twill Overshirt is the template: stretch twill, two flap chest pockets, horn-look buttons and a regular fit with room for a thin knit underneath. It comes in seven colours, from Midnight Black to Mocha Brown and Hunter Green.
- Corduroy. The most autumnal fabric of the lot, and corduroy is one of the textures of the season. It adds depth to an otherwise plain outfit. The Rafael Corduroy Shirt is cotton cord in green, blue and beige. It runs small, so size up, especially if you plan to wear it over a sweater.
- Brushed flannel. The softest option, and the natural home of plaid. Flannel is lighter than twill or cord, which makes it a shirt on its own in early October and an overshirt in a heated office later in the season. The Carson Brushed Cotton Flannel Shirt is 100% brushed cotton with a button-down collar, in eight colours from Vintage Red to Forest Green.
- Utility cotton. For the workwear end of the trend. Extra pockets and a sturdier build give it the chore-jacket character without the boxy cut. The Carson Multi-Pocket Cargo Shirt in Dark Brown or Fern Green is the version to wear open over a tee with jeans.
Skip anything shiny or thin enough to see light through. The full range, from twill to flannel, is in shirts.
Get the fit right
An overshirt is a layer, so it has to be cut for something underneath. Four checks:
- Shoulders: the seam should sit at the edge of your shoulder or just past it. A drop of an inch reads relaxed. Much more and it looks borrowed.
- Room: it should button over a thin knit without pulling across the chest. If the buttons strain or the fabric creases into an X around them, size up.
- Length: the hem should land somewhere between your belt and the middle of your seat. Longer and it starts to look like a coat that shrank.
- Sleeves: they should end at the wrist bone. Over a sweater, a little of the knit cuff showing is fine.
If you're between sizes, take the larger one. An overshirt that's a touch roomy looks intentional; one that's a touch tight looks like a shirt you've outgrown.
What to wear underneath
The overshirt does the talking, so what's underneath should stay quiet.
- A crew-neck T-shirt in white, ecru or grey. The easiest combination there is. Keep the neckline tight so it sits flat when the overshirt is open.
- A fine knit or mock neck for colder weeks. A textured sweater under a smooth twill gives the outfit depth without adding pattern. The Arthur Textured Knit Mock Neck Sweater in Espresso Brown or Charcoal sits neatly under the collar of an overshirt.
- A hoodie, but only under flannel or a utility shirt, never under twill you'd wear to the office. Pull the hood out over the collar so it lies flat.
What doesn't work: a dress shirt underneath. Two collars of similar weight compete for the same space, and the outfit looks like you forgot to take one of them off.
Open or buttoned?
Both, and that's the point. Worn open over a tee, an overshirt behaves like a jacket. Buttoned up with a T-shirt underneath, it behaves like a heavy shirt. Leave the top button undone either way. One rule: don't tuck it in. An overshirt is cut to hang straight over the waistband, and tucking it creates bulk at the waist and makes it look like a regular shirt that's too thick.
Three outfits that work
The weekend version. A twill overshirt in Mocha Brown or Sand Beige, worn open over a white tee, with straight-leg jeans and suede boots or clean leather trainers. This is the outfit the overshirt was invented for, and the one you'll wear most. Boots with a bit of weight balance the heavier top half; there's a good selection in men's boots.
The earth-tone version. Brown is the colour of the season across this autumn's trend reports, and it suits workwear fabrics better than anything. Try the Aspen in Hunter Green over the Arthur in Espresso Brown, with the Hudson Corduroy Cargo Trousers in Cognac Brown. Three earthy colours, three different textures, no pattern needed. If the corduroy is on the bottom, keep the overshirt in twill so the textures don't blur together.
The smart-casual version. A navy or black twill overshirt, buttoned over a fine knit, with tailored trousers and loafers or derbies. Here the overshirt stands in for a blazer: it gives you a collar and some structure without the formality. Flat-front or pleated trousers both work; see men's trousers. Keep the colours close together, such as navy over grey, so the whole outfit reads as one deliberate look.
Colour: start with earth tones
Brown, olive, charcoal and navy are the overshirt's natural colours, and the trend forecasts lean the same way, with tobacco, rust and chocolate brown named as the shades of the season. All of them work with denim, grey trousers and cream knits, which covers most of what's already in your wardrobe.
Pattern belongs to flannel. A plaid overshirt is great; a plaid overshirt with patterned trousers or a graphic tee is too much. Let one piece carry the pattern and keep everything else plain.
When it gets colder
Once temperatures drop for good, the overshirt doesn't go away; it moves inward. Worn under an overcoat or a quilted jacket, it becomes the mid layer that replaces a sweater, warmer than a shirt and less bulky than a heavy knit. The only condition is room: the coat needs enough space through the shoulders to take it without pulling. Try the combination before you buy the coat.
The short version
Choose twill first, corduroy or flannel second. Buy it with room for a knit underneath, keep the layer below it simple, wear it open or buttoned but never tucked, and stick to earth tones. Get those right and the overshirt becomes the piece you reach for from the first cool morning in October until the coats come out.
Overshirts, knits, cords and boots are all in the men's Autumn Drop. Pieces are already marked down, and buying more than one takes an extra 15% off two items, an extra 20% off three and an extra 25% off four.
Read next
- Autumn Layering for Men: Building an Outfit From the Knit Up — where the overshirt fits between the knit and the coat.
- How to Wear Plaid This Autumn: A Guide for Men and Women — how to wear a flannel overshirt without overdoing the pattern.
