It does look like an obsession in some aspects. Relatively speaking I'm guessing the average NZ school is pretty flexible and lenient when it comes to uniform compliance. Aside from occasional outbreaks of silly argument about hair length and style and all that.
Heh, perhaps in some schools. I don't think it would be the majority. My sons school lines the kids up as part of their morning routine and checks them over and issues writs for failure to comply. It's ludicrous. They really need to get over themselves in my opinion, though as a school their students perform to a generally higher standard, but it comes at the price of a significant amount of rigidity.