First of all, keep in mind strongly that the extremely short skirts of school uniform in Japan is not necessarily a sign of loose morals among the youth. Mostly schoolgirls wear short skirts with loose socks as there school uniform. This is also an key part of the uniform of the kogaru, whose aim is to appear young and therefore cute.
Japanese schoolgirl uniforms in Shiga are so short, that the internet and Japanese language Internet is awash with rumors that schoolgirls in the central Japan prefecture wear the skimpiest uniforms of anywhere in the country. Even some girls who are not allowed mini skirt as uniform from their home, they roll up their skirt to make it mini micro after leaving their home.