Do you ask the original owner of hand me down clothing before you sell them?

I think I might have sold a piece of clothing that my sister handed down to me. At the time, she was one and done. Now, I'm not sure. I didn't even think to ask her. Uh oh. I honestly didn't think it was hers. I thought I bought it from another consignment sale. Oops. I did talk to the DH and he think we still have it because he saved it. I hope we still have it.