https://appmedia.jp/magicami/6584593So Magicami added this Beastification or whatever system that acts as an evolution of sorts.
You need a max limit broken dress, maxed skills, and a bunch of mats for it, but they let you skip the mats part for the first time. Except the deadline to use that is next week.
Of the dresses in that list, Ultimate Akisa is the closest I can get, but I dont have enough to max limit break her, so fuck me, I guess.
Seems my best bet is to use it on an event dress, which leaves many options as Oni Kokoa or Swimsuit Kokoa.