Cashmere and wool tees will keep you warm, cool and stylish during the festive season

When it comes to dressing for a party, a T-shirt is usually something you change out of rather than put on.

But this party season, the casual tee is experiencing a metamorphosis. Enter: the cocktail T-shirt.

Made of wool rather than cotton, it typically features a roomy rather than a clingy cut and sleeves that hit just above the elbow. Sometimes it comes with glistening embellishment around the neckline or it is plain, giving the wearer the option to add their own level of glitz with a sparkly necklace or brooch.

“They have that sort of understated look that a T-shirt tends to give the wearer, but unlike the way a cotton T-shirt sort of unravels by midday, the knit has a more polished effect,” says Buffy Reid, the founder of the British knitwear brand &Daughter. She describes the item as having “the same ease as a T-shirt but the elegance of a knit”.