Lex Anteinternet: NCSD Board Policy 5375. Dress Code.: The current NCSD dress code. Usually with something like this, the poster, if he's been out of school over 20 years (and I have. ....the inevitable teenager commenting about how "we're supposed to show our individuality" and how this is squashing it, ran on the news.
Shoot, this has been the dress code for at least 30 years, probably longer. If it was going squash something, it likely would have by now.