> Like, why doesn't the market solve for this?

This is a classic HN reply. The market has solved for what women want: vanity sizing that doubles as (exclusive) social signaling. If you look at the sizing charts from the article, normie brands have a huge range of sizes. The couture / elite brands are all much smaller. It makes perfect sense when trying to build a better-than-normie fashion brand. Do you really think Louis Vuitton or Prada wants women with a size 18 dress size wearing their ready-to-wear clothes? Absolutely not. But they are welcome to (and do) buy bags, shoes, scarfs, and other accessories.