Why are men's and women's clothing sized differently? Why is women's sizing so confusing? What happened to standard sizing and custom sizing?

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Resources:

https://fashion-incubator.com/why-isnt-womens-clothing-sized-like-mens-pt-2/

https://fashion-incubator.com/why-isnt-womens-clothing-sized-like-mens/

https://www.today.com/style/jeans-don-t-fit-here-s-explanation-inconsistency-women-s-t100419

https://time.com/how-to-fix-vanity-sizing/