Blame it on the sudden lust for resort collections, but the lines dividing each season are becoming increasingly blurred. Which means a glut of pieces that are able to bridge summer and autumn, when the weather is unpredictable and you need something lightweight that still fights a chill. Enter, the shacket.

Combining the DNA of a shirt and jacket, this hybrid serves as the perfect layering piece. Many are littered in pockets too, making for something as utilitarian as it is stylish. Wear beneath a pea coat for some extra protection on those frostier days, or as warm-weather outerwear for unseasonal sunshine.

The Collarless Shacket

Levi’s California, which arrived in the UK in 2014, is the denim giant’s sixties-inspired line. The sub-brand is distinguished by white detailing – here, the distinctive buttons which pop against darker material.

The label’s quilted shacket is crafted from a grey, padded fabric with a baseball-style collar that means you can wear still wear it over an actual shirt.

Levi’s California Quilted Overshirt Jacket, available at ASOS, priced £140.

Levi's California Quilted Overshirt Jacket Buttonthru

The Waterproof Shacket

The best transitional pieces are just as adept in warm weather as they are the wet. The Chapman shirt jacket, which forms part of Orlebar Brown’s exclusive collection for Mr Porter, is made from showerproof polyamide so you can weather sudden squalls.

It’s rather more distinguished than your standard pac-a-mac too, thanks to the slim cut and a jersey lining which keeps you insulated when the clouds roll in.

Orlebar Brown Chapman Slim Fit Shell Shirt Jacket, available at Mr Porter, priced £345.

Orlebar Brown Chapman Slim Fit Shell Shirt Jacket

The Workwear Shacket

Nudie Jeans’ take on the French worker jacket is crafted from hard-wearing Turkish slub denim with multiple patch pockets, for storing your tools. Or, these days, smartphone. It also features adjustable cuffs to keep the wind out and side vents for ease of movement.

It’s workwear that you could actually go to work in – be that in a warehouse, or a converted warehouse studio.

Nudie Jeans Julius Organic Denim Overshirt, available at Mr Porter, priced £185.

Nudie Jeans Julius Organic Denim Overshirt

The Zip-up Shacket

A step away from the traditional button closure, this 14oz denim shacket from Leeds-based MKI Miyuki-Zoku swaps buttons for a zip, with that all-important double fastening for showing off your sweater underneath.

The light wash looks weathered off the rail, and the curved hem – longer at the back – will aid your reverse-layering game on those colder days.

MKI 14oz Denim Zipped Overshirt, available at END Clothing, priced £75.

MKI 14oz Denim Zipped Overshirt

The Quilted Shacket

Undercover’s shacket may look suited to a grouse shoot (forest green and diamond quilts will do that) but it’s better for giving a rural tinge to your streetwear.

That means pairing it with cuffed joggers and a luxury leather backpack, rather than moleskines and a 12-bore shotgun.

Undercover Diamond Quilted Cotton Overshirt, available at Mr Porter, priced £320.

Undercover Diamond Quilted Cotton Overshirt

The Sportswear Shacket

Nylon nudges River Island’s overshirt into track jacket territory, giving your looks a sportswear feel, even if the closest you get is the bleachers.

Maintain the activewear vibe, albeit with a smarter edge, with grey cuffed trousers and leather trainers. Because you never know when you’ll need to run for a bus.

Black Nylon Shirt Jacket, available at River Island, priced £35.

Black Nylon Shirt Jacket

The Winter Shacket

Wool can absorb up to 30 per cent its own weight in moisture without feeling damp, as well as acting as a temperature regulator in high heats, making it the perfect material for a shacket that’s likely to battle both.

Private White V.C’s take is made in Manchester – no strangers to rain – so expect all things rugged, including two outer and a single inner patch pocket, as well as removable butchers buttons to avoid damage when washing.

Navy Woollen Shacket, available at Private White V.C., priced £239.

Navy Woolen Shacket

The Pullover Shacket

Trust Alexandre Mattiussi to produce a distinctive take on something ubiquitous. His V-neck shacket throws a golfer’s favourite sweater into the DNA soup, but comes up with something that looks more suited to Clint Eastwood than a stroll round the links.

Although you’re better pairing with a button-down than a six-shooter.

AMI Denim V Neck Overshirt, available at East Dane, priced £211.11.

AMI Denim V Neck Overshirt

The Statement Shacket

C.P. Company made its name with functional sportswear, crafted from cutting-edge materials designed to keep out the worst that the elements can throw at it.

For this overshirt, it means stormproof polyamide and nycra – a proprietary blend of, you guessed it, nylon and lycra – which makes for something stretchy and lightweight.

Garment Dyed Overshirt In Deep Blue, available at C.P. Company, priced £345.

Garment Dyed Overshirt In Deep Blue