You are telling me that I should order size 40 in this slipper. This does not make any sense, unless these run small. I wear a lot of European shoes, and I have never bought a size 40! It's typically the 39 that fits me, although in some cases I end up with a 38.
In US sizing I take an 8 more often than not. Occasionally I've needed to go up to an 8 1/2, although with some brands (such as Clarks) I am a 7 1/2.”
Read my review- mary14889. That's all that I can tell you to be of help.
I have three pair and I just order the size according to chart furnished by STP.
I also wear a lot of European shoes and always fit a size 41 (US 10 1/2). I was a little concerned when I ordered these slippers, because of mixed reviews regarding the sizing. So I ordered two sizes! 41 and 42 - I figured the price was good enough that it was worth the cost of mailing back the pair that might not fit! At first I thought they fit equally well, but the 41 is definitely too small - I can get my foot in, and they are plenty wide enough, but my toes are definitely right at the end of the slipper. The 42 is a much better fit and is not at all sloppy. I sent the 41s back. Hope this helps.