a sewing auxiliary tool used for the creation of garment patterns . the sewing auxiliary tool is constructed from a flat plate and has incorporated around its edges curves and straight line shapes . the geometric shapes of the sewing auxiliary tool &# 39 ; s edge are used to create basic sewing curves ; such as , the hip line , sleeve cap line , armhole line , neck line , and crotch line . additionally , the sewing auxiliary tool can have both metric and english units of length measurement incorporated along the straight edge sections of the sewing auxiliary tool . the combination of the curves , straight lines , and length measurement capabilities provide the user with a single device with which to create garment patterns .