One man's trash is another man's treasure American British proverb
Something which is worthless to someone might be valuable to another.
“Let’s throw away those clothes. They have fallen out of fashion.” - “They are still usable. You should donate them for the homeless. One man’s trash is another man’s treasure.”
“That painting is ugly. Why do they hang them in the house? - “One man’s trash is another man’s treasure.”
This proverb has been used a long time ago both in daily life and literature.