M and L only represent small size and large size, and there is no definite size, just like a small portion of beef noodles in a stall is more weighty than a large portion in a hotel. Because teenagers are mainly pure clothes, but nowadays teenagers are generally thinner. Although some clothes are very long, their bust is not big. 84A and 96A on the clothes also prove this point, because A stands for version A, that is, the thin version, while 84 and 96 stand for bust, although there are differences.