Dress etiquette three colors, three laws and three taboos refers to what

Western dress code: the three-color principle, the law of three and one and three taboos: three-color principle, suits, shirts, ties, shoes, handkerchiefs, socks and so on, no more than three colors. "Little three colors": watch belt, belt, shoes color to strive for consistency, at least belong to a color family. Law of Trinity Business activities, celebrations, signing ceremonies and other occasions, "shoes, belts, briefcases" three parts "to maintain a color (black) reflects the" status, identity "three taboos: 1. wearing a suit, the left sleeve Trademark did not remove 2. wear socks wrong: nylon stockings, stockings, white socks do not wear 3. tie wearing method wrong.