It’s just another excuse for women to take off their clothing.
The very early costumes are a lot less sexualized. Hard to judge on one costume.
I would argue that that is not true. If you compare them to the fashions of the time I suspect that people would have been at least as scandalized as they are today.Even back in the 30’s and 40’s, they were trying to look cute or sexy rather than scary or macabre.