Luckily, the Duchess doesn’t actually have to wear it herself. Her waxwork at Madame Tussauds, in London, does.
The museum unveiled a special festive edition of its famous royal family figures, including Prince William, Prince Harry, Queen Elizabeth and - of course - her corgis.
We can totally get behind Harry’s penguin Primark Christmas jumper.
But as for Kate and Wills’ two-person monstrosity...
Please, don’t try this at home.
Save the Children’s Christmas Jumper Day takes place on Friday 15th December. To sign up go to christmasjumperday.org or make a £5 donation by texting TEAM25DAYS to 70050.