In Torreon, MX., there is a cluster devoted to producing denim garments. There are a number of brand name and contract sewing factories. Over time, the following support groups moved in to take advantage of this business:a) Trim* suppliers (*in a garment, trim is any component that is not the shell fabric, example: Thread, pocketing, buttons, rivets, zippers and so on).b) Fabric suppliers - Warehouses carrying denim from other mills, new mills weaving fabric to sell to the manufacturers.c) Maintenance - sewing equipment sales and services, machine parts, factory maintenance (boiler inspection and repair, vacuum pump service, lift machine sales and service).