Pupils at Merton Abbey Primary School are taking a casual approach to fundraising.
They left their uniforms at home and instead wore denim to support an annual appeal for funds for genetic research.
The 185 pupils from nursery age to Year 6 donated £1 each on Jeans for Genes Day.
It will be used to support the national campaign raising money for children with genetic disorders.
Six Year 6 students performed a play that they wrote, to explain the reason why everyone was dressed in denim.
A giant pair of jeans was also hung from the front fence to remind people to donate to the cause.
Headteacher Stella Fry says: “It is important that children know there are people less fortunate who need their help. It also makes them feel like they can make a difference.”