I've been noticing this for a while. I figured it was deliberate, and sure enough, it's no coincidence.
It helps women look more ridiculous and less original. Very effective.
https://www.dailymail.co.uk/femail/article-3872996/Why-posing-pigeon-toed-suddenly-vogue-listers-turn-knees-look-younger-thinner-child-like-stance-taking-red-carpet.html
https://x.com/thismorning/status/791369567280861184