The so-called "three-color principle" means that all clothes should be kept within three colors. When evaluating a woman's dress on a formal occasion, people often pay attention to one detail, that is, whether she knows that her socks should not be exposed.

It is not advisable to expose the socks when standing, or when walking or sitting. Ladies in skirts, it is better to wear pantyhose or stockings.

Three-color principle of men's suits

Men's suits should be fit, elegant and conform to the specifications. Choosing a suit in solemn occasions should follow the "three-color principle". To put it simply, the "three-color principle" requires that men's clothing, shirts, ties, belts, shoes and socks should generally not exceed three colors.

This is because, from the visual point of view, the colors of clothes are better matched within three kinds. Once more than three colors, it will be chaotic. For example; If you put a pocket handkerchief in the left breast pocket of a suit, it's better to be similar in color to a tie or shirt, otherwise the upper body will look colorful.

Refer to the above? Baidu encyclopedia-tricolor principle