OOmis -“You are correct, but I would remind you that if you look at the mode of dress of many young women (and men) in Kings’ courtyards of long ago, you would likely not consider those fancy outfits to be particularly tzniusdig. But that is the PROPER way they dressed to see the King.”
It seems you are trying to use Litzonus to be Docheh the Mussar. Perhaps you are refering to paintings that you’ve seen. I’m sure those paintings are just from that period of time. If you go back in time even further -I’m sure all dress, even not in Kings’ courtyards was very Tzinus.