yamakaze kai ni (swimsuit mode) (kancolle)
The bikini official alternate costume of Kantai Collection's Yamakaze Kai Ni, as seen in post #5562544.
Her kai ni swimsuit is mostly the same as her base: a black bikini plus frilled bikini skirt, white choker, an open black robe, red sandals, bracelets, and a brown straw hat. The difference is that the innertube she brings (as well as her bikini ribbon) is now colored green. If she is shown with a blue innertube and bikini front ribbon, use the base swimsuit tag instead.
This tag implicates yamakaze_kai_ni_(kancolle) (learn more).