When choosing a hat, what is the standard for the size of the hat?

The specifications of China hats start from No.46, ranging from No.46 to No.56 for children, No.55 to No.60 for adults and No.60 for oversize hats. The arithmetic difference between numbers is 1cm, forming a series.

Generally, the cap size of adult men is 55-56, that of children is 50-55, and that of baby hat is 42-46. There are only 1-3 kinds of adult soft hats, sun hats and sports hats. Knitted hats can be stretched regardless of size, and some are calculated by weight-gram.

Extended data:

Hats are clothes worn on the head, most of which can cover the whole head. Mainly used to protect the head, some hats will have prominent edges, which can block out the sun. Hats can also be used to dress up, protect hair styles, cover baldness, or as part of uniforms or religious costumes. It can be different kinds, such as high hat, sun hat and so on. Some hats have a canopy that extends outward, called a brim. Wearing a hat has different manners in different cultures, which is especially important in western culture, because wearing a hat was a symbol of social status in the past.

References:

Baidu encyclopedia-hat