Students at a leading Sydney high school have won a battle to change their uniform policy to allow students to wear boys or girls uniforms regardless of their gender.

Newtown High School of the Performing Arts students lobbied the school's administration to have the new uniform policy implemented last week.

"Our aim was to remove the un-inclusive gender labels from the school uniform, and make it so that anyone could wear any aspect of the uniform without having to go through a long and difficult process," said Jo Dwyer, a year 11 student at the school.

"Before the changes were implemented, students had to go through the school with parental permission and notes from psychologists before they were allowed to wear the cross gender uniform, and that wasn't really a possibility for some students whose parents aren't supportive of their gender identity," he said.