Well, people used to dress more "revealing" especially when dancing to swing music. People didn't like it because women would dance revealing their bloomers or underwear. People now wear tank tops that reveal women's shoulders, this would not have been acceptable because women were seen as "too revealing and improper" women were only allowed to show skin for their husbands. People have just become more laid-back and accepting that people are allowed to dress how hey want, it's their body.
