190104a is a XL size coat, which usually refers to a man with a height of 190 and a chest circumference of about 104 cm. XXXXL size is the extra large size, which is far from the smallest size s. It is more suitable for tall and burly people.
Nowadays, no matter where you buy clothes, you need to know your height, weight and other information, so you don't have to bother trying on clothes one by one. Generally, the common sizes are s, m, l, XL and so on.
190104a refers to the size of the upper body, that is, the body with a height of 190cm and a chest circumference of about 104cm. Most of them are men, so this corresponding is a XXXXL size coat. Generally, most of these men are tall.
Generally speaking, l refers to clothes in large size, XL refers to the larger size, and XXXXL naturally refers to the larger size. Compared with other sizes, this is very large, s refers to the smallest size, and there is a big gap between the two.