Thanks for your comments.
The underlying theme is not just that they could have a dress code, but that there was a person with authority to enforce it. If you can get yourself appointed to do the dress check, then you say why you allowed jumpsuits or not. This story reveals another attack on authority and rules. Not really new in any way except for the existence of this new style of designer jumpsuits.
You are absolutely right she should have asked, but you see that would uphold and legitimize the authority. Can’t have that...
Parents now object to as you say anyone having authority. No wonder so many have issues holding jobs.