These Boots are made for Walking...

So I have this pair of boots that I am passionate about. I fell head over heals for these boots when I saw them in the store. I typically fall head over heals for any boots as long as they are available in my size. (Size 11 for good since I had kids) However, I get depressed every time I pull my beloved boots out of my closet and try them on. I got my legs from my dad's side of the family. Before I discovered Boots (when I was in High School and still athletic) they were my pride and joy, I had great legs, and they were strong too; I spent a lot of time in the weight room and could out press (on the leg press obviously) all of the other girls. I had the highest vertical jump and everything, and that was great when my athleticism was the most important thing in my life. But no that I am a grown up, I use the term loosely because I use that to differentiate myself from my children, I crave the ability to wear tall boots with a pair of jeans tucked into them. I can't my beloved boots can only be worn underneath pants because I cannot zip them up all the way. I wish I knew a way to stretch them out, if that is even possible. Any one know anything about this, or have a suggestion on tall boots made with room for ladies with big calves?