kk650 said:

Correct me if I'm wrong but as far as I'm aware that is how light works.

Ouch.

In my experience white light sources are a far more reliable way to get the correct white balance of a film than clothes.

That may be true for most films, but as we know, Star Wars is special. For example, take a look at this shot:

It has white lights that are entirely white (255 across the board), and the clothes are quite different than your later shot, which also has completely white lights. In many cases, I expect that the brightest values have been clipped, so it's anyone's guess what color things should be. If you're going for a global fix there's only so much you can do to fix things, and you're practically guaranteed to make some other things worse in the process. Good luck to you, but I would warn against examining the movie too much if you're not planning a shot-by-shot correction, or it will suck you in as it did me. ;)