BJ, I'm so happy that you have solved the problem of keeping a diaper on a cat. I've made note of your idea...leash and collar attached to the diaper, ingenious!
Yeah, that was a very quick development on our part! There's a cut section of a leash pinned on both the front and back of the diaper. We also have to put a strip of medical tape around the waist so that the diaper's fastening tabs don't pull off, and also to keep her from pulling her legs out of the holes.