Dirk wears a dark green peaked cap with a black brim and a gold V on it. He also wears a brown bomber jacket and a brown backpack. This possibly holds a parachute. Dirk also wears an eyepatch and has a mustache.
Dirk was meant to speak during Dirk Valentine. This is evident by a message avatar existing for Dirk, found only in the files of Dirk Valentine. This idea was likely scrapped early on in development. However, the presence of an avatar may indicate that this speaking was meant to be Dirk replying to Monty, or Dirk talking to himself.