Looks like that thong goes up her back to "cover" her breasts. The best tag we have for that seems to be sling_bikini.

Santana Kaku: AWAKEN, MY MASTERS!
Strazio Yoshika: Yeah!
Kasen Joestar*: Yoshika?! Didn't you die last chapter?
Yoshika: I ate some spirits and was K >∀<
<TojiDC, Whammuto, and Mikars AWAKEN to HOLY WUBSTORM music>

*Debated whether to use Kasen or Hatate here, but ultimately Kasen makes the cut because this can be how she loses her arm.