School attire

Curious, just what is the dress code. at school these days for short skirts? I see young ladies from the local high school here wearing short shorts, very tight fitting. I think there should be dress code rules requiring a more modest code! Short shorts should be out. What IS a reasonable skirt length? I am ok with tight fits, it is the lack of coverage that seems too lenient. This particular young lady has very good sense of style and rocks her styles fantastic.