Pervert-proofing the uniforms, are you serious? What they should be doing is to make dirtbags afraid of doing whatever they please on a train and properly punish those who dare. You know, fight crime, not the victims.
iirc junior high is their middle school, and japan's middle school is only 3-year long (grade 7 - 9), and senior high means highschool (the hungry gorl explained that even though she's 17 year old, she's still a first-year of senior high)