The three-color rule requires men to wear a suit in no more than three colors on formal occasions, usually dark blue suit and gray suit. This principle aims to maintain a sense of gravitas and formality, and avoid excessive colors that appear disorganized.
The trinity law states that shoes, belts and briefcases should be the same color, usually black suit. This rule emphasizes the coordination of accessories to enhance the unity and high-end sense of the overall image.
The three taboos include not removing the logo on the sleeves, wearing woolen socks or white socks on formal occasions, and strange neckties (choose pure wool, silk is appropriate). These taboos aim to avoid inappropriate dress behavior in formal occasions and affect the overall image.
These principles and taboos form the basic etiquette of men's suit wearing together, ensuring a professional and appropriate image in formal occasions.