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Its not "any one of his silk robes".

Its "His favorite magically treated silk woven, dyed with a rare Arancian dye, that he tends to wear every couple of days and gets upset if they cannot be found" even to the point that he's jailed three of his previous servants for having lost them or other serious infractions" Robes

And there is no guarantee that they'll be a pattern item, but it would probably be the most likely choice.

Maybe the entirety of his wardrobe is a pattern item, with a favourite in the collection being sufficient to represent the whole.

Do note, though, that the example works "backwards". Trying to find an item from the knowledge.

Hmmm, interesting, I hadn't considered that.

Thanks Arma.