http://www.aclu-wa.org/detail.cfm?id=59Teachers' Clothing
In the landmark Tinker v. Des Moines Independent Community School District case, the U.S. Supreme Court established that public school students have the right to wear armbands in class as an expression of their views on topics of public concern. This right may be limited only if there is good reason to believe that the speech would cause a substantial and material disruption to education or violate the rights of others. Washington courts have not considered the question, but courts in other jurisdictions have differed over whether teachers have the same right as students to display personal political messages on their clothing. A court ruled that a New York teacher could not be fired for wearing a black armband in protest of the Vietnam War because the armband had caused no classroom disruption, was not perceived as an official statement of the school, did not interfere with instruction, and did not coerce or "arbitrarily inculcate doctrinaire views in the minds of the students." On the other hand, in another case a court upheld a dress code that prevented teachers from wearing political buttons in the classroom because school districts have legitimate authority to "dissociate themselves from matters of political controversy."