Christmas jumper day is a special day where people wear a certain type of sweater called a jumper. These jumpers are usually very colorful and have decorations like snowmen, reindeer, or even Santa Claus on them!
People wear these jumpers on Christmas jumper day to show their love for Christmas and to raise money for charity. Sometimes, companies or schools organize events where everyone wears a Christmas jumper and donates money to charity.
It's a fun way to celebrate the holiday season and spread some cheer while also helping others. So, if you see someone wearing a Christmas jumper on Christmas jumper day, just know that they're supporting a good cause and enjoying the festive spirit!