On page 1 of PNIN) we read "His sloppy socks were of scarlet wool with lilac lozenges; his conservative black Oxfords had cost him about as much as all the rest of his clothing (flamboyant goon tie included)
snip
The term "goon" remains obscure but was apparently a slang term with the definition "(ice hockey, pejorative) An enforcer or fighter" {presumably applied to the team Cornell was playing against).