I have the new mountain horse sc3 lite and it fits my pretty wide calves. I also tried on some Ariats and they come in Wide and Full, i forget which one is bigger but the one that is is a little wider then usual.
I recently got a new pair of Ariats. I dont remember which "model" but they were about $280. I LOVE them. I had actually gotten the cheapo (Saxon's maybe?) with the EquiLeather in extra wide and they barely fit and the zippers kept breaking. I took them back to Dover and tried the Ariats. The wide fit me great. They were definitely tight and hard to zip the first few times but now theyre PERFECT. So comfortable. I ride in them every ride.
Weirdly enough, the Ariats (wide) fit GREAT in the calf and are obviously smaller in the calf than the Saxon's. The Saxon's I had were extra wide and had a larger measurement in the calf but were so crappy they broke repeatedly.
Charlie Brown (1994 bay TB X gelding)
White Star (2004 grey TB gelding)