I don't really follow. You are to appear naked?

The First Amendment argument or defense is frequently misunderstood. It concerns the interaction between a society and those that govern. Easy example, all pedestrians walking around the city must wear suits and ties. That would be an infringment, arguably, on somone's first amendment right of freedom of expression. BUT, my employer can tell me I have to wear a suit and a tie.

So- if this woman (a private citizen) is telling people what they can or can't wear...she can do that. Course, no one has to listen to her. BUT, the government can't say, "if you want to protest on the courthouse steps, you must wear black". They could say, "if you want to protest, you must wear clothes", as there is a genuine public interest to advance in requiring citizens to wear clothes on public property.

So, not sure exactly what your facts are, they were unclear. And, I do not practice in the area of (boring to me) First Amendment Rights.