William.
WTF is on your arms.
I think the katakana reads "aankai" but not really....
Theories that have emerged to WTF are those things:
-Arm warmers
-Arm guards
-Braces of a sort
-Record-chan prevention
-Something to do with Jazzercise
-Floofs
-Filled with candy
-Filled with anti-Grell potpourri
-Utility braces with smokescreens
-They contain the Captain Bureaucrat costume
What's your theory?
EDIT: The katakana reads "aankaba" = arm cover. How boring. But still an odd thing to see under his jacket.