Mary Beth and John Tinker, along with Chris Eckhardt wore black bands on their sleeves to protest the Vietnam War.
Their teacher asked them to take the bands off, and they refused. They were sent to the principals office, and then suspended.
Angry that their first amendment rights had been violated, the Tinker's took the issue to court. The case was eventually taken to the supreme court for a final decision.
The supreme court ruled with the Tinkers, saying that we should have the freedom to express ourselves in school. The supreme court said, "Students don't shed their constitutional rights at the schoolhouse gate."
Due to this case, we today have the right to express ourselves through our clothing to a certain extent. As long as the expression isn't affecting the learning environment, its allowed!