Save the Children is asking people to make the World better with a sweater. This is to help raise money for their life saving work, which helps the most vulnerable children, in the poorest countries, with things such as vaccines and mosquito nets. Save the Children work in more than 120 countries.
So take a selfie – sharing it on Twitter or Instagram with the hashtag #XmasJumperDay.
Text “TEAMJULIESNB” to 70050 to donate your £1.
If you are a blogger and you blog about the campaign, along with a selfie of you in your Christmas jumper, then Westfield will kindly donate £10 to Save the Children – just tweet the blog post to @westfieldlondon.