The invention provides for drawing of garments cut-out a garment cut-out rule needless to calculate. Successively, irregularly and repeatedly arranged thin graduated slices are assembled between transparent upper rule plate and opaque lower rule plate, and they are drawn by equidistant movable joints. Before drawing, the arrow head is regulated once for all and the motion of graduated slices are controlled. Each graduation indicates the actual length of the usual ratio of measured surrounded size of garments respectively, and this is to measure and draw the different parts of garments with calculated surrounded size proportions. Attached 1/2 proportion scale and 1/5 value of the neckband size on the head part of chi scale are used for other proportion calculation, measurement, and drawing. On the head part of each proportion scale, there is a part of cun graduations to regulate, add or substract, and to fix the final size, thus the whole process of cut-out drawing will be done......