High School rule book states:
Rule 4, Section 1, article a. If sufficient reason is determined by the referee a tight fitting, short sleeved or sleeveless undershirt of a single, solid color....
Kids modifications state: The legality of all uniforms is up to the referee, and need not conform to the NFSHSA rule.
Keith Ashpole should probably weigh in on the matter, or it will be up for debate every match.