The difference between pill placket and corner placket is that the corner placket is square while the pill placket is semicircular. The corner placket is the same as the suits we see everyday. The front of the collar is square, and the pill placket is semicircular.
The collar (placket) of sailor clothes changes with the color of the clothes, and the line size is mainly divided into four different (not very visible) "regional" characteristics. In the Encyclopedia of Women's High Uniforms, there are two major lapel systems: the Kanto lapel system is Sapporo lapel system, and the Kanto lapel system and Nagoya lapel system are Kanto lapel system. Although Kanto and Kansai lapels are in different lapel systems, they are not very different. The collar of Kanto lapel is close to a straight line from a circle, while the collar of Kansai lapel is a straight line. The lower part of the back of Kanto lapel is smaller than that of Kansai lapel (visible to the naked eye). The collar of the Kanto lapel is above the chest, and the part of the Kanto lapel is above the chest (because personal shape and other factors are not obvious). Kansai lapel must have a bra, but not Kantung lapel. The Kanto and Kansai lapels will be more popular, which may be more suitable for the public's aesthetic appreciation. They also have a higher degree of acceptance, and can highlight the body shape. The magic card girl Sakura is the Kanto lapel.