As a fellow wide calf girl on the hunt for the perfect tall boot this fall/winter, I understand the challenge! So, I just searched the WWW to find you every cute tall wide calf boot I could find. I've not personally tried these on, but I did look at the reviews/information and from what I can tell, these all look like great choices.
The only boots I can personally vouch for are the ones from Torrid (#3,4,5), they are consistently nice and wide on the calf and the fact they are WW for the foot is great for me as well.
Remember, wide calf doesn't always mean wide foot. I am a wide foot, wide calf girl, but I did include boots with a wide calf for M, W and WWW sized feet. And, I also included some great rain boots, since living in the NW we live in the rain for 9 months of the year.
Hope you find what your heart is yearning for and if you know of any I may have missed, please comment below and leave the link!