The above are examples of school uniforms from Tesco with the pinafore costing only £10 and the boy's trousers made from Fairtrade cotton are only £6.50 so you aren't breaking the bank and still buying great quality school uniforms. They also have a section for uniform embroidery where some schools have joined up with Tesco and they will donate 5% of what you buy to that school. So this makes finding everything you need for your little one's big day easy, low-cost and of good standard that you'd expect from every school uniform.
And let us not forget the important shoe wear. I was a fan of shoes with little butterflies and flowers on them but my school wouldn't allow anything apart from black shoes, but my mom was cheeky and got some that had tiny bit of embroidery of butterflies that you could barely see. Today schools aren't so strict and don't mind girls with a little bit of detail on their shoes but the code is always black and Tesco has shoes to suit all school standards.
Best of luck for the new school year!
