His famous leather cap (designed by Helen Anderson) could be described as a Bakerboy style or Newsboy style cap, though I have also seen it called Maciejowka, which is a Breton or Greek fisherman style cap. However, I would say it is entirely unique to him and I should know!
He customised his favourite cap with a Ferrari hat pin  - when he passed his driving test he bought a Ferrari! You can read all about this in my story.