shirt or shorts?

DO NOT ask me what is going through this kids head. I have had a non stop battle with him ALL day today. For some reason he wants to wear shorts on the upper part of his body instead of the bottom the way they were invented to be worn. I show him that there are only 2 holes and his shirts have 3 holes. so he has gotten every pair of pajamas out of his drawer and threw down the shirt and fought to get those bottoms on to his head. by the way he has a thing about pj's, that is all he will wear and when he does he likes to wear more than one at a time. His favorite color is orange and I know this because he has one pair of pj's that are supposed to be worn in the winter and yes it is very much summer now, but he wears them EVERY DAY plus more on top of that. Then he has the days he will wear nothing at all. None of my other boys did this kind of stuff.