What is this outfit called? The foldy pits at the bottom make me think it's not a kimono or yukata, but I don't really know.
>>348430
Judging by the tags on Gelbooru, it is a combination of a yukata/kimono and a "hakama".
https://en.wikipedia.org/wiki/Hakama
So, yeah, the top half is definitely a kimono, but from the waist down (or below the breasts here, since you apparently wear the hakama as high as possible) is the hakama.
>>348443
Thanks