Genesis 37:3

3. Israel loved Joseph more… because he was the son of his old age. “The ancient Jewish interpreters do not consider this as describing the parental partiality for the latest born, but render, because he was a wise son. (Onk.) Maimonides says, that as late-born he stayed at home, and was his father’s stay, the nourisher of his age, a careful son, whom Jacob thus naturally loved with special affection. So Fagius, Bush, Lewis. And he made him a coat of many colours, (figured or variegated, Samuel, Sept., Vulg., Targ.,) or, more likely, a sleeved tunic reaching to the ankles, such as was worn by persons not much engaged in manual labour, the ordinary Oriental tunic being, like a loose shirt, girded about the waist, without sleeves, and reaching to the knees. So Gesen., Knobel, Del. after Sym., and Aquila. Lewis understands it to mean a tunic with spots, stripes, or fringes; so A. Clarke, who compares it with the striped and fringed toga of the Roman youth. This dress was intended as a badge of distinction, as rank has always thus been indicated in Oriental countries. Probably it was the badge of the birthright (Bush) which Reuben had forfeited, (1 Chronicles 5:1,) and which was transferred to the eldest son of the favourite Rachel. Jacob very unwisely makes his preference thus conspicuous, and thus subjects the virtue of his favourite son to a test most painful and severe.” Newhall.