I first wrote about boots for wide calves three years ago and interestingly, not much has changed since then. It's the same sites carrying boots for plus size women. I was going to write an update to that post but honestly, I haven't found a great reason to. However, the good news is that the retailers who are carrying wide calf boots update their styles every year and there are lots to choose from.
If you've been shopping for boots, you'll notice that most wide calf boots have about a 17 - 20 inch shaft circumference. It depends on where you carry weight but that would probably fit up to about a size 22-ish woman. This is great but I'm not a size 22, I'm a size 24 - 28 (depending on the... yeah, you know). The widest point on my lower leg measures 20 inches so while I could probably wear the more generous wide calf boots, they'd be a little snug. Is there a term for when your leg fat is squished out at the top of your boots? Leg muffin top? Not cute.
My mission was to find the boots with the widest circumference and I think I've found them.
Pecan boots from Avenue. They have a very generous 23 inch calf circumference, thanks to the lacing up the back. The only problem is that they're a WW (extra wide) width so if your actual foot isn't wide, then you might have some slipping around to contend with. My solution would be a thick ankle sock, which would be super comfortable and warm anyway. They're $99 and come in black and brown, sizes 8 through 13.
Keep in mind that I haven't tried these on so I have no idea how they fit or feel. I had a pair of Avenue shoes that I wore to death and they were pretty comfortable and good quality for the price.