In-universe fictional character from Sono Bisque Doll wa Koi wo Suru cosplayed by Kitagawa Marin.
Marin wears an officer's cap with a fleur-de-lis and an officer's jacket with epaulets and fringes. Beneath that she wears a cap. There's also an imitating jewel on her chest. Her dress is layered and fringed at the edges. Her accessories also include a choker and black gloves. She wears different color contacts symbolizing Heterochromia, her left being blue and her right being red.
https://sono-bisque-doll-wa-koi-wo-suru.fandom.com/wiki/Marin_Kitagawa#Cosplay_2:_Black_Lobelia