Some can be interchanged, however, if necessary. A neckline zipper, for example, can be shortened (see Zippers) and used as a skirt zipper. Size ranges given represent the overall output of all major manufacturers , and can very within any single brand. Also, size increases do not necessarily come in 1” increments; some styles increase in increments of 2” or more . Depending on garment design, application may be by the centered, lapped, exposed, or fly method (see Zippers).