Hereorthere, the gossip you are discussing changes. The tznius doesn’t change much.
Charlie, that’s a very good point. When I was in elementary school, I had a teacher that really stressed that long skirts were absolutely under no circumstance tzanua. She refused to allow the thought that there were other shittas on this. She made us all feel so guilty about wearing long skirts, that I took to wearing short skirts (AKA above my knees) because she never stressed that and I felt less guilty (I didn’t wear short skirts for that long). It wasn’t until after 4 years of a good high school that I truly understand the full error of her ways and the guilt over long skirts (which my rav holds is 100% muttar) started to erode.