SilverWook said:

If only you could find someone who owns one of the McQuarrie concept helmets...

http://www.starwarshelmets.com/EFX-mcquarrie-darth-vader-helmet.htm

This is what should have been on screen in ROTS. Why should Vader's suit not have evolved or changed at all in twenty years?

My Revisited FB page response to this same suggestion:

As much as I like the McQuarrie piece I think that it might actually look TOO cool for us to then move on from there to the OT look we're all accustomed to. I think it would be a lot like many of the other mistakes GL made when making the PT....making things too cool, too updated, too perfect for them to be followed up with the out-dated universe we see in the OT.