Tone's second remodel/kai ni.
After upgrade, she has a much more visually distinct appearance, wearing a shorter green jacket, a long black skirt with such extreme side slits as to make it a pelvic curtain, and no visible underwear. Although as revealed in the supplementary material for the 2016 animated film, she wears some form of extremely highleg panties, the straps being high enough to hide under her jacket.
This tag implicates tone_(kancolle) (learn more).