When buying clothes, I always listen to the waiter introduce version A and version O. What does this mean?
The O version they are talking about is the European version, and it is also the version that originated in Europe. This kind of clothes may not look straight, but it is more comfortable to wear, while version A distinguishes the fullness of clothes. The standard version is A, and the fatter version is B \ C. If you are tall and thin, you can wear version A (because the version with the lowest clothing output is A), otherwise you have to order it.