The default costume of hololive's Ookami Mio.
It's a black serafuku consisting of a cropped sleeveless black shirt with a white sailor collar and a red neckerchief or necktie with a kouhaku nawa motif, a red choker, a pleated black miniskirt with a cross-laced side slit and a floral print near the slit, black detached sleeves secured with a kouhaku nawa rope and decorated with jingle bells. white tabi thighhighs and zouri-like sandals.
This tag implicates ookami_mio (learn more).