Before I came to the personal conclusion that I’d prefer Freewheelers in this realm (not to knock on WH, as I said it was just a personal thing), I tried to understand this. Then I gave up.
I did preorder one WH thing this year because it was pretty unique - but it was a one off jacket and I just went by measurements and product description, which is what I’d do if I ever bought their jeans again because I’m not sure if WH even knows their labeling system at this point.