To stretch your sleeve you would have to regularly eat to the point of pain. Even doing that it would STILL be tough to stretch this very un-stretchy part of the stomach, because you're more likely to simply toss up those extra bites than keep them uncomfortably sitting in your smaller tummy long enough to do lasting damage.
That said, it's important to learn your new full signals and stop before you get to that point. We all take a little time to do this and it's normal to overdo it a few times before learning exactly when to stop. Certain foods swell in the stomach and cause issues. I have a real problem with Pasta and tortillas. Some people have an issue with scrambled eggs or bread.
My full signals are a runny nose, the hiccups or a feeling of tightness in my chest. If I go beyond that, I'll toss it back up or suffer discomfort.
~Cheri