My DS will not wear underpants, he won't wear trousers without a nappy. He will happily go naked on the bottom half and takes himself to the toilet when needed but if wearing a pull up he will just go in the pull up. Does anyone have advice on how we get past this? He is in school and we are out and about a lot, places where going naked is obviously not an option. We've tried him choosing his own pants, pants with a pull up and bribery but he will kick and scream and remove the clothing.