Haori | Demon Slayer: Kimetsu no Yaiba | Shinobu Kocho

Over her uniform, Shinobu wears a white haori that previously belonged to her older sister, which has a butterfly wing pattern, specially that of a Monarch Butterfly, that fades into a pale turquoise then pink color gradient on the sleeves and hem which are cuffed with a black and white dotted trim.

Demon Slayer: Kimetsu no Yaiba  
In Taisho-era Japan, Tanjiro Kamado is a kindhearted boy who makes a living selling charcoal. However, his peaceful life is shattered when a Demon slaughters his entire family. His little sister Nezuko is the only survivor, but she has been transformed into a Demon herself! Tanjiro sets out on a dangerous journey to find a way to return his sister to normal and destroy the Demon who ruined his life.

Shinobu Kocho is a major supporting character of Demon Slayer: Kimetsu no Yaiba. She is a Demon Slayer of the Demon Slayer Corps and the current Insect Hashira.

Shinobu is rather laid-back, always having a smile on her face regardless of the situation she is in. She seems to enjoy teasing others and can be rather sadistic about it, enjoying most notably to pick on Giyu Tomioka. Being a Hashira of the Demon Slayer Corps, Shinobu is one of the most powerful and skilled swordsmen in the entire organization.

Shinobu is also the younger sister of Kanae Kocho along with her adoptive younger sister Kanao Tsuyuri. After a demon killed her parents, Shinobu joined the Demon Slayer Corps along with her sister in order to protect others from suffering the same fate as her.

(from Kimetsu no Yaiba Wiki)