Keep in mind that the rumor (and it IS a rumor... so take it as you will) was that Fett, even when he was paired down to a single character, had a much more significant and active role in ESB. As much as I would have liked to see more action, it might have destroyed his mystique and I am glad he was left obscurea nd shrouded in mystery. The assumption is that these helmets were indeed leftovers from ESB stunt scenes that never made it beyond the script...![]()
In the Ralph McQuarie panel the speaker who is the writer of the new book they were talking about said that Ralph was given a version of the script where Fett became a main character and that is where the second revisions of the more western looking character came about. The sketch where Fett has a poncho, came from that script.