Okay-- Now I remember why I signed up for this site. I'm the only opening liberal Christian I know. Thanks for letting me know I'm not alone.
I'm not taking a position on the proposed law here, but school dress codes are different than public law. Schools receive federal and state money and are required to provide an atmosphere conducive to learning (which is all but impossible, but that's another post entirely).
On a somewhat related tangent, I'm much more offended by the window sticker on the pickup in front of me at the traffic light throwing me a middle finger or urinating on a disliked automotive logo than I am by sagging pants. But that's just me.