kitakoji_hisui_(1st_costume)
The original default costume of Nijisanji's Kitakoji Hisui, as seen in post #4040980. She used it from August 2020 to March 2021 when her current default was released.
It is the same Selene Girls school uniform as her gen-mates (black collared shirt, blue plaid necktie, white jacket, armband with the words "SELENE GIRLS SCHOOL", a black pleated skirt with white fringe), but includes black thighhighs, brown loafers, and a brown vest.