The objectives of this project are to develop attachment of weaving preparatory machinery such as 2-for-1 twister, winder, yarn texturing machinery, twister and composite twister for developing the composite yarns and fabrics for natural/PET garment. In addition, the optimum processing conditions such as yarn tension, guide position, over feed and yarn feed speed are surveyed with various natural/PET composites yarns such as Viscose/PET, Cotton/PET, Rayon/PET, Wool/PET and Acryl/PET. Also the various physical properties of the composite yarns such as thermal shrinkage, thermal stress, tensile modulus, yarn bulkiness and elastic recovery are measured and discussed with various processing conditions. Using these yarns, fabrics are made and their physical properties are measured and discussed with various yarn properties.