The clothing shape will be changed when a wearer moves or changes his pose. The clothing pressure which acts on the body will be varied according to these changes of clothing shape. In this paper, the changes of clothing shape, the tension of fabric, the clothing pressure on body will be measured. The Digital image processing will be used to measure the changes of fabric shape. The relationship between the changes of clothing shape and the fabric tension, between the fabric tension and the clothing pressure on body will be discussed.