Well, it's a spoiler but anyway..
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I haven't solved it myself, but I did read something about it. Idea is that you keep the golden pantaloons you get from BG1, then the silver ones you get from BG2, and the bronze ones you get from BG2: ToB. You will then bring them all to some NPC smith (or something), who can then make you some goodies. But I forgot what goodies and which smith and where..
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