Put him in situations where he had to take that armor off. Catch him sleeping. Send the PCs to a banquet where weapons and armor are uncouth. Challenge him to a classic duel.
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He umm, can't. It's kinda cursed. (He hasn't choosen to dispel the curse yet because I tied +1 of the +2 into it. Lose the curse, lose the +1.)
Still might be fun to stick him in those situations though

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