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Can a refund be reversed?

Today I went to return a Christmas gift I bought myself because I realized it was a impulse buy and not something I would actually wear. I went to the Gucci store and gave the jacket to one of the store personnel. He inspected it and processed my refunded without any concerns or questions. I received a call about a hour later from the store saying that the jacket was dirty, and for me to go back to the store to get it, and that they will be doing a charge back. This is a $2,700 jacket that was checked completely by the store before I was able to return it. How it got dirty I dont know, and I doubt it was dirty when it was in my possession because I didn't even get a chance to wear it.

I was just wondering if it is even possible for my refund to be canceled after I have left the store. If the jacket was dirty like they say, it shouldn't have been accepted, and the refund should have been denied. Could I possibly be looking at my refund being charged back, or is that not even possible?