My boots were to tight for me 6 months ago, and now they are more comfy then ever! I can not stand tight things at all, so I would know if they have stretched or not. And they did!
Jilllyan - you just pretty much agree'd to what I origionally said. Yes, leather can be stretched, but once the leather has been stretched, I have never heard of it going back to its origional state.
Once you stretch your boots out to be where they need to be, they remain in that stretched state for the rest of the boots life.
Over all the years I've ridden, I know the tedius process it takes to get your leather to supple up and stretch to make the new boots very comfortable for you to wear, and never have any of these boots ever gone back to their origional state after the stretching process was complete.
My MIL has a pair of very expensive English Riding Boots that she spent hours stretching and making comfortable. Then she quit riding for 2 years, and the boots are exactly as they were when she used them after the stretching process.
I have sold leather boots because overtime they stretch, and become too big for me in my ankles and calves - For example, a pair of my Mountain Horse Sportive High Riders have overly stretched, now they have to go. Heck, I can slide the boots on without even unzipping the zippers, that's how much they've stretched.
Once leather has been stretched out, I have never heard, nor seen - it going back to its origional state.