Your Christmas jumper may be more than just a crisis of fashion.

Environment charity Hubbub is warning that the rise of the novelty geansaí nollaig is contributing to the plastic crisis.

The charity examined 108 jumpers on sale in high street store in the UK – and found that 95% of them were wholly or partly made of plastic.

It also found Christmas jumpers to be “one of the worst examples of fast fashion” – with two-in-five only ever worn once.

Meanwhile, one-in-three people under the age of 35 buy a new one every year.

Hubbub creative partners Sarah Divall said consumers are often "unaware" of the environmental cost of their shopping.

“A lot of people are concerned about plastics in the oceans but they don't realise that the stuff they are wearing also has plastic in it as well,” she said.

“You should still enjoy Christmas – no one is saying that this means that you don't get to have fun.

“There's a way you can join in: wear a Christmas jumper but swap it or see what you have in the cupboard, or see if you can borrow a friend's so you don't have to go out, spend loads of money and buy something new that you're probably only going to wear once.”