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The idiom "part brass rags" refers to someone who is very poor or has low social status. It's a figurative way of saying that the person has nothing left to offer and is almost destitute.
The exact origin of the idiom "part brass rags" is unclear, but it's likely that it dates back to medieval times when people would use brass rags as an alternative to cloth. During this time, many people lived in poverty and had limited access to clothing, so living in part brass rags would have been a humiliating experience. Over time, the phrase became associated with someone who was very poor or had low social status. It's possible that the idea of living in brass rags became a metaphor for living in poverty or being destitute.