No, there is, of course, some recommended dress code for tours to theaters and restaurants, only it exists to tell you personally what is appropriate in this case to wear, and not to control others, discuss them and especially laugh at someone. All this reminds the atmosphere of the cult march of the local nobility on the travelling artists, where they go not so much for a concert or performance, but rather others to see and show themselves.
It’s funny that some people have enough culture just to dress up in a theater or restaurant.
Z.U. And we do not yet know what dresses are there, it is possible that they are only suitable in a garrison bordell.