It’s weird that you keep saying only “class” when you mean both class and race.

Up until very recent history class and race were inseparable constructs. Even now you could legitimately argue that even the wealthiest black members of society are not truly part of the ruling class in western society.

During the time periods and activities we were discussing assuming that race is part of class is perfectly reasonable. Specifically when it comes to dress codes class is going to be more of the focus.