Wilson's Dictionary of Bible Types
Isaiah 64:6 (a) In the Hebrew the word means a body rag on which the vile effusions of the body are found. Nothing is more filthy. So the natural righteousness of people which is made up of the natural effusions of the spirit and mind are an abomination to GOD. No one would for one moment consider the advisability of giving to another person, as a gift, a cloth on which there were the vile things that came from the human body. The Spirit of GOD uses this illustration to show that whatever comes out of the human spirit as a natural product of the human spirit is a vile abomination to GOD. This refers to self-righteousness, religious pride, character-building far salvation, and good works which are offered to GOD as a reason far salvation and forgiveness.
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Watson, Walter. Entry for 'Rags'. Wilson's Dictoinary of Bible Types. https://www.studylight.org/dictionaries/eng/wdt/r/rags.html. 1957.