I freely admit that this is rather insane nitpicking and a massive hypothetical workload for a purely aesthetic reason, and I know everyone who hated the PT jedi robes will disagree..........but:

One thing I actually dislike in ROTJ, and always have, is Luke's costume. I understand the symbolism of him going from white (ANH), to grey (ESB), to black in ROTJ to reflect his growth and maturity.....but to me it contradicts the more important visual element of black representing the sith and/or the darkside.

Now of course you can argue that black is supposed to represent how he is still struggling with the temptation of the darkside.....but that still rings hollow to me because if anything that should mean black on black is still too strong for his character. Instead, I would change it to something more reflecting anakin's clothes:

Now the rotoscoping effect for that clip alone took me an hour or two which means that it'd be pretty crazy for anyone to try and do the whole thing so it's probably not viable....but I did like the result and it was fun to stretch my legs on rotoscoping again.