279.58  School dress code policies.
  1.  The general assembly finds and declares that the students and the administrative and instructional staffs of Iowa’s public schools have the right to be safe and secure at school. Gang-related apparel worn at school draws attention away from the school’s learning environment and directs it toward thoughts or expressions of violence, bigotry, hate, and abuse.
  2.  The board of directors of a school district may adopt, for the district or for an individual school within the district, a dress code policy that prohibits students from wearing gang-related or other specific apparel if the board determines that the policy is necessary for the health, safety, or positive educational environment of students and staff in the school environment or for the appropriate discipline and operation of the school. Adoption and enforcement of a dress code policy is not a violation of section 280.22.
95 Acts, ch 191, §20