By the way, I heard a beautiful story just the other day.
A Frum woman from Israel was visiting some relatives of hers in America. She took her young daughter with her. They are a Chareidi family, but the mother thought that as a treat she would take her daughter to Disneyworld (or Disneyland, not sure). The two women of course wore long skirts and loose long-sleeve shirts, even in the blistering heat. There was some sort of parade or something, and many young girls were clamoring around one of the princesses (either Cinderella or Snow White, I think) for autographs and to try and say hello. The “princess” singles out the 11-year-old (give or take) girl and said so that the whole crowd could hear her, “This is the proper way that a young girl and real princess should dress”. That is what Tznius is. It is dignity and refinement even when surrounded by the opposite (even if the opposite is just trying to avoid the heat, which R”L it’s usually not).