Sackcloth, i.e. a coarse and mournful habit. This is the first example of that kind, but afterwards was in common use upon these occasions. See 2 Samuel 3:31 1 Kings 20:31, 1 Kings 21:27, &c.
Related Commentaries of Genesis 37:34
Genesis 37:34
34 And Jacob rent his clothes, and put sackcloth upon his loins, and mourned for his son many days.