Yeah, what nahneun said. You've already bent over backward for this guy. He's extremely lucky that you were willing to sell back a jacket you bought and paid for months ago, and it was kind of you to do so. To now say, "whoops don't want it back after all, take it back" is ridiculous and wasting your time. Get ebay records, get paypal records, and tell him (politely) he's out of luck, and hope he doesn't open a claim.