What's the name of the triangle that jk sailor suit buckles inside?

College wind sailor suit scarf JK uniform triangle. Jk uniform means the uniform of female high school students. Jk sailor suit consists of coat, skirt and triangle towel (bow tie and rope). Jackets are divided into sailor collar shirts and square sailor suits. The coat is wide on the top and short on the bottom. The coat is wider than the joint of the skirt, and the coat is shorter, which can be slim for slightly fat girls. Thin girls are more petite against the background of sailor suit.