How illogical is it in the US ... women's sizes different from men's ...

...
In UK there is rough "cross-read" between guy and girl sizes, just that guy's shoe's tend to be a bit more generous for room for a given size to allow for chunky socks rather than hose, knee highs, or the thinner hoisery we tend to wear.
I do encounter US sizing in Tk-Maxx and some department stores with a lot of their "designer" imports, and I know I'm between US Ladies 8 & 9 ... (UK 6 & 7, Continental 38 & 40).
So guess I'm lucky as I'm well within normal women's range ...

... no embarassment asking shop assistants for UK size 8 or 9 ...

... (like US 10 or 11) which so few women wear ...
Guess my real nightmare is buying knee or calf high boots (which I love) as my foot width and arch is wide, yet my calves are really thin ... leaves me to resort to specialist retailers who size their calf fits to nearest half inch and do different foot widths ... and I end up paying $360 for a nice pair of boots which would be $220 in a normal shoe store !
OK prices a "crossdresser" would not be willing to pay, but for me an investment as I will be living in the selection of boots I buy hopefully for two winters before they go out of fashion or fall apart !
Laura x