Here's some Ralph Mcquarrie Coruscant art.
http://www.sithtower.de/sithtower/blue/index.php?title=Coruscant&file=coruscant
Honestly, I doesn't really look much different than how it ended up in the prequels, same with Aldeeran. About the Jedi robes: how would you explain why Yoda, Ben and Anakin all wear Jedi robes as ghosts in the end of ROTJ?