The third costume for hololive Indonesia's Moona Hoshinova, as seen in post #4861261.
It consists of a purple/dark blue jacket over her shoulders, a black choker, a short-sleeved white cropped t-shirt with her name written on it, black jeans, and black sneakers. She also has a single earring on her left ear.
Her official hairstyle is short hair with swept bangs.
This tag implicates moona_hoshinova (learn more).