Heh heh, I went through this today! My one DCB refused to undress himself fully (he did his hat and jacket but refused to even try and do his shoes and splash pants). I left him on the mat until he did this (much to my assistants horror because he screamed and she felt we could just do it). Luckily I'm the boss and I told her more than once to ignore him and go play with the other kids. 5 minutes later he was undressed and he joined us.

My assistant is a lot like the parents described above. She also questioned me when one of the kids refused to eat lunch and asked what I was going to make him as an alternative? When I told her nothing she was mortified. 10 minutes later he had a clean plate.