No longer the Christmas season's fashion faux pas, festive jumpers have become an essential for office parties as well as the big day itself.
But Christmas Jumper Day is the time when more people seem to simultaneously throw on the green and red knitwear, decorated with reindeer, snowmen and Father Christmas.
It is organised by children’s charity Save the Children. The charity provides help and assistance to children in the UK and all over the world.
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Since its launch in 2012, the event has raised more than £27 million.
A host of celebrities have given their support to this year’s Christmas Jumper Day, including Holly Willoughby, Emma Bunton, James Blunt and Katie Piper.
When is Christmas Jumper Day?
The annual Christmas Jumper Day fundraising campaign will take place on Friday, December 10.
And this year marks the tenth Christmas Jumper Day, so it's a pretty big milestone for the charity.
But if you're busy on Friday, or it's just not the day to don a Christmas jumper then never fear - you can wear your festive knitwear on another day that suits you, just don't forget to donate.
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What is Christmas Jumper Day?
On a specific Friday in December every year, people are encouraged to make the world better with a sweater and raise funds for Save the Children by wearing a Christmas jumper.
You are also encouraged to donate £2 to Save the Children – or £1 if you are at school.
How to take part in Christmas Jumper Day
Taking part in the holiday is easy and fun. All you need to do is come together as a community wearing your flashiest festive jumper jazzed up with jingles bells or sparkles
Over 21,000 workplaces and 1.2 million workers have already signed up this year to spread joy on the day.
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