I read something about this some time ago. I think you're over-egging the pudding somewhat.except its not, its more natural, the narrow hips are a consequence of unnatural intervention over the decades in births
Going purely on memory, it was a surprisingly low increase in narrow-hipped women. Going from something like 5 in 100 women who were unable to give birth naturally 50 years ago to about 6 in 100 now.
EDIT:
it's 30 in 1000 in 1960 to 36 in 1000 in 2015
https://www.bbc.co.uk/news/science-environment-38210837

He constantly had girls with film star looks hanging off his arm. We always joked that he could have had more women than all of us put together. I lost touch for a few years then by chance met up with him again. He had a lady with him who one could only describe as dowdy, if not plug ugly. Turned out it was his wife of 9 months.