There are various proportion methods for making garment boards, such as L/3, 1/4, 1/5, L/6, L/8,10, (2/ 10), L/60. However, after careful consideration and analysis, it seems that it should be summarized into three types: the L/6 (1/2) proportional method in the oriental costume culture of China and Japan; Simple proportional method commonly used in China (110, 1.5/LO, 2/10); L/8 (116) proportional method used by western countries such as Britain and America. L/6 (112) proportional method is the basic proportional method. Strong adaptability and wide application range: it can be used for 2cm classification (Japanese), 3cm classification (China) and even 4cm classification. It is derived from the circumference formula of a circle (circumference = diameter × π). When the calculation requirements are not accurate, the workers' masters simplify it as follows: circumference = l/3 circumference ×3. In the garment board, the perimeters of three circles are all the perimeters of a circle, and the formula is substituted: bust = L/3 bust ×3. When making clothes, the base number is half bust, and the formula can be evolved into: half bust = L/6 bust ×3. This is the recipe for making a three-piece coat. The formula for making the four-piece suit of coat, trousers and skirt can also be derived from the above formula: half bust (half hip and half waist) = L/6 bust (hip waist) +L/ 12 bust (hip waist). (Note: Waist circumference is flexible) Mathematics is the foundation of science and technology, and its laws, theorems and formulas have universal guiding significance and practical value for science and technology. Clothing plate-making technology is no exception. The L/6 (L/ 12) scale method originated from the perimeter formula, so Mr. Wei Lida's evaluation of its plate shape is "more objective and scientific, without artificial color." Of course, the feasibility of flexible, reasonable adjustment and special application in order to adapt to different scales and different plate types and due to regional and national differences is not ruled out. 110, 1.5/ 10, 2/LO scale methods are simple scale methods for designing urban "dresses" created in early China. Because it is simple, fast and easy to be accepted by most people, it is widely used in fashion design in China. It became a habit over time. It is difficult to change the habits formed by history in a short time. So, today, the simple proportional design of clothing still occupies an orthodox position in the domestic clothing industry. Simple proportion method has made brilliant achievements for the development and prosperity of China garment industry. China's current national clothing standard is based on the general measurement and investigation of human body data all over the country, with reference to the simple proportion method. It can be seen that it is authoritative in China clothing industry. It is the crystallization of China's traditional experience, so it is regarded as the "national quintessence" by the clothing industry. But it is difficult to integrate with other proportional methods, which is also a fact that cannot be ignored. L/8 (116) proportional method is a simple proportional method adopted by Britain and the United States to adapt to the British system and its clothing patterns and ergonomic data. It has a long history and great international influence, and is used by most western countries. Westerners are not strict with the national clothing standards. They pay attention to detail reduction and make clothes fit tightly, with special emphasis on the "people-oriented" design concept. So it's hard to control. After "restructuring", the board type can only be used for 4cm grading. But it is easy to connect with the basic proportional method. With the globalization of global economy, the scale of clothing board is unified in centimeter system. Most countries in the world have completed or are completing the adjustment of board-making technology in the "reorganization" of clothing standards. No matter who will complete this "reorganization" technology, first of all, what is the international standard? Otherwise, it is easy for blind people to ride blind horses, and it is difficult to realize internationalization of clothing plate-making technology. What is the standard of internationalization of garment board production? Internationalization standards are centimeter system, perimeter calculation formula and the skills of connecting with it. In fact, it is very simple to restore the urban inch scale method to the Chinese centimeter scale method. Please look at the following formula. The grading formula of the centimeter system of 3cm is: bust = 1.5/lo bust +2/ 10 bust+1.510 bust. Half bust = L/6 bust+1/6 bust +L/6 bust. Its fader grading values are chest width and back width, and its fader grading values are that chest width, back width and armhole width are all 0.5 cm (1.5 cents).