Carly, I take your point about the scarlet robe, but surely that's what he was wearing when the soldiers were tormenting him before being put back into his own clothes to be led out for crucifixion? Of course, that's not to say that Tammy couldn't employ some artistic license here and paint a scarlet robe.
Incidentally, I always understood scarlet to be a bright red tending towards orange. Is there any evidence that the biblical term translated as scarlet was a more rose-mauve colour (i.e. tending more towards blue)?