Then, in the 40's, the waist appears, and the bust is larger with smaller hips:
In the 50's, we get more curvaceous:
The waist is a full 8" smaller than the bust - 2" smaller than the previous decade - and the hip size is almost the same as the bust. Even though (according to studies) women's waists were naturally smaller in proportion to the rest of their bodies, it was totally accepted to wear girdles and other foundation wear on a daily basis. In fact, it was expected - there's a scene in 'Anatomy of a Murder', where Jimmy Stewart is trying to make Lee Remick a convincing, virginal witness, rather than the 'loose' woman she appears to be. The best way to achieve this? He tells her to 'wear a girdle, especially a girdle'. Enough said.
And what does Paris think? She would have an opinion, but she lost interest and is too busy trying to make the measuring tape into an accessory: