MN Mike,
(sizes mentioned below are in the American system)
I wear a 10 - 10.5 in shoes, maybe an 11 in hunting boots where I want to wear a pair of socks on each foot.
The shoes from Flying Canoe Traders that I own are wonderful, buckle type, and they are 9.5, and I wear thick, wool, knee length socks in those.
For me to get the proper width in my Fugawee Hi-lows (purchased to give me better ankle support) I had to get a size 12. I wear very thick socks as well, but that's what I had to do, and I tried several different sutlers when I went looking, so it wasn't a case of me getting an "odd" pair (imho)
I also had the Rockville Shoe Hospital put on a second sole, so that I could put proper hobnails on the things. They are good shoes/boots, just not very wide.
LD