Why are there 7 buttons on the shirt?

There is an old saying in China that "four or six is not bad". Generally, clothes buttons should avoid even numbers, and five or seven buttons are better. Take women's cheongsam as an example, sometimes as many as nine or eleven pieces. The length of five buttons on men's shirts will make the gap too large, so seven buttons are generally chosen. This is influenced by ancient traditional ideas, because there is a folk saying that "four or six are not bad". It is taboo to have even buttons on clothes, and it is considered auspicious to have odd buttons on shirts. The above is explained from the perspective of China traditional culture. One school says that numbers are the essence of everything, and "7" stands for opportunity. It doesn't matter if you don't have the ability to count, but you must have a number of thinking when thinking. When many problems are difficult to explain, why not boil down to "providence"