A Bas Yisroel is a princess. If you wouldn’t walk around the King’s courtyard dressed the way you do -you shouldn’t dress like that in public. First realize how great you are and then you’ll always want to do the right thing! “
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.