Sankai's dress code consists of a steel blue blazer over a white dress shirt; male students must wear a green tie, pleated cerulean trousers, and white shoes, and female students must wear a string tie (which color varies according to which class), a pleated cerulean skirt, black kneesocks and white loafers. As the weather progresses, the students can take off their steel blue blazers, and the female students wear a yellow waistcoat, then all students would wear shirt with short sleeves.