... specifically authorized to implement uniform clothing requirements of their students. [ N.J.S.A. 18A:11-7.] Under the Act, the decision to implement a dress code ... and to keep the focus of the classroom on learning." N.J.S.A. 18A:11-7. These stated purposes are rationally related to the State's ... classroom behavior "to facilitate and maintain an effective learning environment," N.J.S.A. 18A:11-7, is unrelated to the suppression of free expression. Finally, the ...