nekomata okayu (4th costume)
The 4th costume of hololive's Nekomata Okayu, as seen in post #4638798.
It consists of an open black jacket worn over a partially unbuttoned white collared dress shirt and a purple neck ribbon and no pants. Her shirt has a couple of button gaps, which reveal that she's apparently not wearing a bra. She also wears a slippers with a dog print on it; matching with Korone's cat print slippers.
Her official hairstyle with this outfit is medium messy hair with blue on the inside and diagonal bangs (although many artist often omit this detail and draw her with blunt bangs or just messy bangs instead).
This tag implicates nekomata_okayu (learn more).