|This has no clear connection to the Forgotten Realms.
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The hat of difference was a magical chapeau that changed the profession of the wearer.
A person who donned the hat of difference was able to switch to any profession different from that he or she actually followed, such as fighter to cleric. They began afresh in this new path, but advances they made were cumulative and remained as long as the owner retained possession of the hat and only while they wore the hat.