Japanese teen culture(NSFW)

In Japan most japanese highschool girls skirt needs to be long (below knee level), school set up this rules.
But most of the student will fold their skirt many times after passing the school gate, mostly teachers will wait in the school gate to check on their student. This rule is like (do it if you like rule) as you can see japanese girls every where wearing a very short skirt. They do this because it is Kawaii (cute), and some of the girls will buy Misepan(panties that are bought so even if someone sees them it is kawaii). some girls dont even bother even their panties are visible to others. here are some example.