(1) An LEA shall include in its student discipline code a provision prohibiting students from wearing, while on the grounds of a public school during the regular school day, clothing that exposes underwear or body parts in an indecent manner that disrupts the learning environment.
(2) An LEA shall specify in its student discipline code the disciplinary actions that shall be taken against a student for a violation of subsection (a).
(3) Subsection (a) shall not be enforced in a manner that discriminates against a student on the basis of race, color, religion, sex, disability, or national origin.