The striped tunic (Genesis 37, translated accurately. "Colors" is not in the Hebrew).
Why did Jacob give Joseph this special tunic?
According to Jewish tradition, Jacob showed encouragementtowards Joseph; not what we should call favoritism.All of Jacob's young sons were striving for righteousness (and Jacob never suspected that dangerous jealousy might arise). Among pious scholars, "jealousy breeds greater scholarship" (Talmud, Bava Batra 21a), because they direct the instinct for jealousy only towards the outlet of positive competition.
Jacob saw that Joseph was, at the outset, the wisest of his sons (Targum, Genesis 37:3) who had absorbed all of his (Jacob's) teachings (Rashi commentary, ibid) at a young age. Also, when Joseph saw that his half-brothers born of Leah were more friendly among themselves than with their half-brothers born of Bilhah and Zilpah, he took the initiative to open up to the sons of Bilhah and Zilpah (Midrash Tanchuma, Vayeshev ch.7); and he also spoke with criticism concerning the sons of Leah (Genesis 37:2; Rashi ibid) in order to spur them to improve the ties among the brothers.
Because Jacob observed Joseph taking the most initiative in wisdom and righteousness, he took action, giving him the gift of a special tunic (Genesis 37:3) as a token of leadership, and to provoke the positive kind of "jealousy among scholars." Even after the unfortunate result (Genesis ch.37), Jacob never rescinded the gift or regretted it, since he himself had not erred in judgment (it was only the brothers who erred, as they later acknowledged [Genesis 42:22]); and he even reiterated Joseph's high status decades later (Genesis ch.48-9).
See also:
The cause of the jelousy was that Jacob gave Joseph the youngest son a robe of many colours.
It was a coat of many colours.
A robe.
the sheaf in Josephs dream represented him and his brothers sheaves bowing down to him which made his brothers jealous.
Josephs brothers smeared blood of a animal on Josephs famous colored coat. And they told their father that a wild animal killed him.
jealous
Joseph's brothers were jealous when Jacob gave Joseph a coat of many colors as a gift, as it symbolized favoritism towards him.
Even as the brothers were jealous of Joseph they did not kill him , they sold him as a slave in Egypt.
joseph
His brothers were jealous and so they sold him into slavery
The stars in Josephs dream stands for his brothers and father as well.
Joseph wore a coat of many colours which made his elder brothers jealous.
The brothers of Joseph did not recognize him , as they had sold him to be a slave, and here he was dressed in rich clothes , as the man just below pharaoh in Egypt. This was the last place the brothers expected to see him.
As Joseph was the favorite son of Jacob, Jacob gave it to him, and the brothers were jealous.
If you were to say the coat of many colours you would be partly right, what they were jealous of was that Joseph was his fathers favoured son.