Pants or pajamas?

Me:  You are not wearing those to work are you?
Manchild:  Why not?
Me:  Because those are pajamas!
Manchild:  So.  There comfy and warm.
Me:  So are jeans.
Manchild:  No, mine are skinny jeans and they are to tight.
Me:  So why don't you go out and buy you a real pair of regular fitting jeans?
Manchild:  Cuz I like these, they are warm and comfy.
Me:  They are pajama bottoms!

I give up!  Where is the logic here?