It's just a generally expensive jacket. In canon it's from a fashion designer called Kelsey Evans, and that line is mentioned by various members of the more affluent cast. It's an "oh you've got MONEY money" jacket that only the very wealthy would even be able to recognize at a glance
It's less that the jacket is supernatural (though it obviously is) and more a giveaway to the rich that Pocket is not the homeless shmuck they're masquerading as.
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u/TearOpenTheVault 17d ago
He also compliments Pocket for their jacket!