The school my wife works at had a kid getting suspended for wearing something he wasn't supposed to (I forget what it was, this was two years ago or so) and the AP who suspended the kid got fired.  


Though different teachers do treat rules differently.  My wife won't send a kid to the office for breaking any dress code rules unless it's such a blatant violation (Giant holes where they shouldn't be, etc..) .  But there are other teachers who will report any kid for anything.  So just because other kids got away with it, may just mean that other kids didn't get caught by the same teacher.  But if there is no rule, then I could see whoever suspended them getting fired (and they probably should be)  And I believe Kansas is a Right to Work state, so not much union protection probably (though I'm not positive about that)

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