Quick update here.
Miles wore under ware for a while yesterday and hopefully all day today ( minus sleeping time). We ventured to the YMCA as usual. I had his diaper bag with changes of clothes for when he had an accident. Well..drum roll please....he not only stayed dry for the 1.5 hours he was there, but he also told someone he had to use the potty--and then used it!! YAY!!!
We celebrated in the car with Altoids all around!