Some friends serve at a local mission connected facility that gives free clothing to the homeless.
They started having similar problems with people treating it like it was Walmart and they were shopping.
The fix was to bag up the clothing by size and gender and they got what they got.
This operation might do well to adopt a similar model. Not only would it calm the anxiety, it would also streamline the process.
It might be better to charge $1(93 cents plus tax)/garment.
I see a lot of discarded clothing.