A lot of guys will just plop an ESB helmet onto an ROTJ costume and call themselves ROTJ:SE, when in actuality they don't put on the 4 extra belt pouches, the hose on the left gauntlet, etc....which would qualify them as that costume. 
There's 5 different Lucasfilm ROTJ jetpacks that we know about on TDH, so basically just pick whichever weathering scheme you like and follow that one. They were all over the place with the paintjobs on them, too. Some have a dark blue and a bright yellow, others have a bright blue and a dark yellow, etc. :jetpack