ZkinandBonez said:

I also think it's pretty amazing that they predicted Luke's black outfit several years before ROTJ. I doubt that it's anything but a coincidence, but it's still pretty interesting.

Actually, he's quite well known for following the comics. He's even been spotted purchasing the new Marvel run. There's also an established precedent of him borrowing from the comics. Pretty heavily in the case of the PT. As for the OT, there was an early Marvel story simply titled THE EMPIRE STRIKES! that was published well before the release of Empire. So I wouldn't be surprised if he borrowed that or had the Marvel depiction of young Obi-wan on his mind while working on ROTJ.