I don't know a thing about Western boots or showing, but I also have man calves and teeny tiny feet, and am really short on top of all that, so finding any tall boots is a nightmare. I was immediately going to suggest Ariat's though. I got a great pair of insulated tall winter boots
, and while I was trying them on at the tack shop, the nice lady who helped me told me they were the best of the brands they carry for large calves (as she was zipping them up for me since I couldn't do it myself since they were pretty snug!!
) They also do have a little stretch to them, so after wearing them all winter, they do fit nicely now. And I no longer have to ask my husband to zip my boots for me!
If they make something in a western style, I would say it would be a good bet.