We've been wearing underwear all the time, he still has accidents but they are becoming less and less. On our outings we put a pullup over top of his underwear and when we get to our destination we take him potty immediately. So far this seems to be working ok. He has more accidents when we are out but training in my opinion takes time. He will eventually get there. I'm ok taking it slow, and in my opinion we are much more happier because of it.