School uniform busting, which method is the best in getting the school to change their policy?

School for many is right around the corner. If a cache of students who are tired of the uniform regiment want to their school to change the policy on uniforms, and they want to boycott should they:
• Go to school out of uniform.
• Go to school in uniform but don’t go to class and clog the quad, etc.
• Go to school, go to class, but not participate.
• Don’t go to school altogether to get the faculty to notice.
Which would be the most effective, if nothing more to voice their displeasure, and how much of the population would they have to get to agree to stand with them, IE 45%, 67%, more or less, for the action to have any teeth?