間宮(水着)
The [[bikini]] [[official alternate costume]] of [i][[Kantai Collection]][/i]'s [[Mamiya (kancolle)|]], as seen in post #2423152.  

Her swimsuit consists of a [[frilled bikini|frilled]] [[black bikini]] with [[sandals]], while still wearing her [[rigging]] to her back.
mamiya (swimsuit mode) (kancolle)