A real fan

Mark is a huge fan of children tv-cartoon-series "Thomas the Tank Engine". Not only he sees them every morning, but he also has several kinds of toy trains from the episodes (I think now we are getting close to owning the whole collection of them, I am loosing count), he remembers each name of it, plays with them every day. He takes them for a walk, feeds them, builds garages for them and even puts them all to sleep before going to sleep himself. A week ago Anna bought him a shirt with his favorite hero - train Thomas. Now he wouldn't let u take it off! First thing in the morning while dressing up he demands the Thomas shirt to be put on him, and don't even try to suggest something else. Today before Mark's sleep time he wouldn't even let me to put his usual pyjamas on and insisted on sleeping in Thomas shirt. It took time to convince him that the shirt is also very tired and needs some rest from Mark. Mark stared at me with disbelieve but later after a long conversation I managed it and he let me put on his pyjamas but made sure his favorite shirt sleeps right next to him.