genesis 37:3 Now Israel loved Joseph more than all his children, because he was the son of his old age: and he made him a coat of many colours. - Free Bible Online

      3. son of his old age--Benjamin being younger, was more the son of his old age and consequently on that ground might have been expected to be the favorite. Literally rendered, it is "son of old age to him"--Hebrew phrase, for "a wise son"--one who possessed observation and wisdom above his years--an old head on young shoulders.
      made him a coat of many colors--formed in those early days by sewing together patches of colored cloth, and considered a dress of distinction (Jud 5:30; 2Sa 13:18). The passion for various colors still reigns among the Arabs and other people of the East, who are fond of dressing their children in this gaudy attire. But since the art of interweaving various patterns was introduced, "the coats of colors" are different now from what they seem to have been in patriarchal times, and bear a close resemblance to the varieties of tartan.

JFB.