An Irish person, since every single Irish person has fluorescent orange hair. They were used in train tunnels in England for luminescence before modern paint was created.
"Why’s that scruffy alcoholic have blinding orange hair?"
"Oh, he’s just an Irishman – a carrothead, if you will."
Pajama casual is a term used when working from home and preparing for a video conference. All business above the waist and your pajama pants down below.