JonBenet did still wear Pull-ups when needed. That was another "explanation" for the big panties - Patsy said they were to wear over the Pull-ups sometimes. I forgot about that.
I have a child that has a similar problem. She doesn't need pullups now, but when she did it used to really embarass her, especially if we had company staying with us. We did the underwear over the pullups a few times. She just borrowed her sister's. I hadn't thought of it though concerning this.