1. A method for preparing a set of patterns for the cutting of material thereto for forming pieces which, when joined together form a garment, each of the patterns in the set prepared in relation to a specific size of garment to be produced therefrom and the patterns are provided with stitchlines in positions along which the cut material will be sewn such that groups of the stitchlines, when joined together, form a seam of the garment, and at least one of the stitchlines in at least some of the groups is provided with an allowance in the length thereof as an ease factor and wherein the ease factor allowance, for each of the groups of stitchlines is provided and checked during the creation of the set of patterns by following the steps of: analyzing the fabric from which the garment is to be made and the style of the garment; allocating an ease factor value for that seam; selecting one of the stitchlines of the seam as a dominant stitchline, the remainder as subservient stitchlines; including the ease factor allowance in at least one of the subservient stitchlines; comparing the total length of the subservient stitchlines, including the ease factor allowance, with the length of the dominant stitchline and checking that the difference between the lengths is equivalent to the allocated ease factor allowance; and repeating the steps for each of the groups of stitchlines for each seam in the set of patterns.