By using the image analyzer, the area, perimeter and shape factor of interthread space of fabrics of used brassieres were investigated. The results were as follows :
1) The correlation between area (A) and perimeter (PE) of matrix was significant. As the sample was worn, the distribution of A-PE extended along the parabolic curve.
2) The fluctuation width of shape factor (SF) was in the range from 0.34 to 0.43 for the used sample as well as new ones.
3) The fatigue is found frequently on the back center and on the back straps, and little in the both sides.