Wiktionary
n. A container in which clothing is placed to be donated to charity organizations.
Wikipedia
A clothing bin is a container in which clothing is placed to be donated to charity organizations (e.g., the Salvation Army or The Smith Family) or for recycling in other ways. They are typically provided by the charities themselves or by local authorities.
Bins are often vandalised or filled with unsuitable materials (including rubbish). These are costly for the organizations concerned to dispose of, and this misuse has at times lead to bins being withdrawn. On-the-spot fines are often threatened through signs on the bins.
Usage examples of "clothing bin".
They looked great in their white uniforms, brisk, clean, and iodoformy, but then they would put on a red dress or a purple pants suit, or a peasant blouse and a plaid skirt, and they looked as if they had closed their eyes and grabbed something out of a Goodwill clothing bin.