mikuma (2016 swimsuit mode) (kancolle)

The original bikini official alternate costume of Kantai Collection's Mikuma, as seen in post #2440523.

It comprised of a plain red bikini and matching red flippers, with a bodyboard carrying her real-life seaplane deck pattern and her nickname "Kumarinko" printed on it. The outfit gained notoriety for its bad anatomy and was never repeated, instead opting to go for a new swimsuit design that's been used since 2017.

This tag implicates mikuma_(kancolle) (learn more).