What does mex on the clothing trademark mean?

It is sheer nonsense for netizens to adopt that. If you don't know yourself, please don't make up an answer to mislead others. MEX is Mexican code, and there are also EUR European code, UK British code and US American code, which are the size standards of different regions and countries. General zara, Pull and other European and American brands of clothes & these sizes often appear in the neckline of the bear.