This petition was rejected

The Government e-Petitions Team gave the following reason:

We can't accept your petition because the UK Government and Parliament aren't responsible for the issue you raise.

This is a matter for individual schools, not the UK Government or Parliament. Schools set their own uniform policies, which could include allowing students to wear their own clothes to school.

You could start a new petition calling on the Government to ban mandatory uniform policies in state schools, if that's something you'd like to see happen.