Here is a theory. What do 你 think? Ted Mosby is an Architect. Wesleyan has no Architecture major. He also taught Architecture at Columbia which seemingly would require at least a graduate degree. There is a 圣诞节 episode where Barney wears some
This is because Barney was sick and therefore Robin took him back to Ted's apartment and because Barney was wearing his suit and they are probably uncomfortable (I am a girl so IDK) and so he had to put on Ted's sweats.....