Now Israel loved Joseph more than any other of his sons, because he was the son of his old age. And he made him a robe of many colors. (Genesis 37:3)Although Moses didn't tell us so, I suspect that Joseph's coat wasn't simply a coat, but a mantle like Elijah's, a badge of a divinely appointed office. I also suspect that it was made in exactly twelve colors, one for each of the tribes of Israel over which Joseph would be given authority. Recall that the High Priest's breastplate, as well as the foundations and the gates of the New Jerusalem, contained twelve precious stones of twelve different colors explicitly representing the twelve tribes. The coat, given to him by his father like a blessing of the firstborn, was an independent confirmation of the prophecy which Joseph was soon to receive in a dream.