SRD:Robe of Powerlessness
From D&D Wiki
|This material is published under the OGL|
Robe of Powerlessness: A robe of powerlessness appears to be a magic robe of another sort. As soon as a character dons this garment, she takes a –10 penalty to Strength and Intelligence, forgetting spells and magic knowledge accordingly. The robe can be removed easily, but in order to restore mind and body, the character must receive a remove curse spell followed by heal.