Charles Ellicott Commentary 2 Samuel 13:18

"And she had a garment of divers colors upon her; for with such robes were the king`s daughters that were virgins apparelled. Then his servant brought her out, and bolted the door after her." — 2 Samuel 13:18 (ASV)

A garment of divers colours. —This word is used only here and in connection with Joseph (Genesis 37:3; Genesis 37:23; Genesis 37:32). It is supposed to mean a tunic with long sleeves, distinct from those with short sleeves commonly worn. This fact is mentioned to show that Tamar must have been recognised as a royal virgin by Amnon’s servant, as well as by everyone else.