I have the biggest calves in the world (it's true, Norris McWhirter wrote it down on his clipboard) and I've only ever owned one pair of freak knee high boots from Evans about 10 years ago but no more since.
Yes I could get Duo boots but have you seen how wide they would have to be? Boots to fit me would be like triangles. Far rather a stick in a bucket than that.
I've always had footballer's legs, even when I was slim. I'm an oddity :(