Why is the hourgl figure so rare nowadays?

Because we eat differently to women in the 1940's-1960's. They ate healthy food, often home grown or made from scratch. The vast amount of women nowadays, and men eat junk food. They also didn't have as much transport and they would often walk to their destination. I wouldn't call the hourgl figure rare but it's not often you get a Marilyn Monroe shaped woman, but Dita Von Teese has a tiny waist, she's very much an hourgl shape.