So I've been trying to tie in the Holiday Fett paint into the grand scheme of real world things. So the Prototype Fett suit gets painted up to PP1. That's going down mid 1978. At the same time, the animation must be underway for the TV special due out that Christmas. Notice this PP1 lid paint up. You can see they're going to start adding the green and detailing, but note the base colors. Coincidence?