When a character wears an outfit or accessories belonging to another character for some reason other than cosplay (trying to dress as the other character).
Might apply to cosplay posts if the borrowed costume is incomplete, or the borrower is wearing it on top of their ordinary costume, or the owner is also shown while not wearing that garment.
Don't add posts if the character canonically wears those borrowed garments at some point of the story, unless the garments or the act of lending/borrowing them is the focus.
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