It might be petitionable, but I think the GM's would see that as an added risk and not a glitch that you lost the robe knowing that there was an inherit risk. Its worth a try but I doubt you might get it back. Best thing is have the bard reimburse you for the avg price of the robe and settle it mutually.
Alternatively, you could have the bard PL your alt's for whatever the going rate is to make up form the time, just a creative thought that doesn't force him to come up with cash right away and could repair the situation ^^
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