The default costume of hololive's Hakui Koyori.
It consists of a black choker, a frilled white long-sleeved lab coat with pink notched lapels and cross-laced sleeves worn over a frilled white collared sleeveless cropped shirt hanging from her breasts, a loose pink necktie, a pocket watch, a chest belt, a black armband, a black pleated miniskirt with cross-lacing and frills, a white belt with a belt pouch with several test tubes, a black pantyhose pantyhose (although sometimes its depicted as a brown pantyhose), a thigh strap with a thigh pouch with vials on it, and black pumps with pink bows on the back. Both her skirt and her coat have cutouts for her tail.
This tag implicates hakui_koyori (learn more).