But ROTJ had Anakin in the same robes, too, so it's hard to say.
And, Darth_Evil just had to remind me of the implausibility of the C-3PO thing. My personal favorite is when Anakin says that he built him to help out his mom. Yeah... like a slave in the ass-end of the galaxy really needs a protocol droid that can be programmed to learn 6 million forms of communication. Unless maybe he was originally designed like that urban legend trading card. He never did specify in exactly what way 3PO was supposed to be "helping" his mother, now did he? ^_~