Danbooru の英語定義
The uniform worn by students at the Mandelbrot Polytechnische Oberschule in Signalis. Consists of a blue pinafore dress worn over a white collared dress shirt, with a red neckerchief. The dress has a cutout around the chest. Interestingly, flashbacks to Ariane's time at Mandelbrot show the students bullying her to be wearing gas masks with glowing red lenses. This is likely a representation of the fear she felt at the hands of her bullies rather than an actual part of the uniform.