C.H.
I had the same problem with my boy last year and I found that by having him wear his underwear around the house made him feel big and strong but we still had to have him wear his pull ups out and about. I realized that by telling him that the pull up is just like "big boy pants" and that he was to keep it dry and clean. We had a reward system set up that at first when he kept the pull ups dry he would get something special after dinner and if he could do it all week then we would make a special trip to the park. He looked forward to having a sticker put on a poster chart that we made and it seemed to help out my 3 year old at the time.