Here "Jacob" represents his descendants. Because Jacob was the brother of Esau, the people of Edom are spoken of as if they were the brothers of the descendants of Jacob. Alternate translation: "your relatives who are the descendants of Jacob" (See: [[rc://en/ta/man/translate/figs-metonymy]])
To be covered with something is an idiom for fully experiencing it. Alternate translation: "you will be completely ashamed" (See: [[rc://en/ta/man/translate/figs-idiom]])