The default costume for hololive Indonesia's Moona Hoshinova, as seen in post #3859585 and post #4966549.
It consists of a black choker, a white jacket with long sleeves which she wears off shoulder, worn over a skin tight cropped black shirt shirt with a wing collar and a blue bowtie with a star brooch, a pair of black short shorts, black thigh high heel boots. She also has a single hoop earring on her left ear.
This tag implicates moona_hoshinova (learn more).