The case is A.A. v. Needville Indep. School Dist., decided today; the opinion is written by Judge Higginbotham and joined by Judge Wiener, but Judge Jolly dissents. Here is the opening paragraph of the majority opinion:
A Native American boy and his parents challenge a school district’s requirement that he wear his long hair in a bun on top of his head or in a braid tucked into his shirt. We agree with the district court that the requirement offends a sincere religious belief and hold it invalid under Texas law.
For more details on American religious exemption law, see here.