The object of this study is to develope an improved version of brassiere with better fit and improved performance by conducting a try-on test on 6 types of revised brassieres (constructed on above basis). The study procedures consisted of a try-on test of experimentally constructed brassieres and a sensory test on fit. The results of experimentally constructed brassiere trial are as follows. 1. The sizes showing performance effects due to different types of experimentally construct- ed brassieres were bust length, bust height, under bust curve length, vertical and horizontal bust diamenter, upper-lower bust slope angle (direct measurement, parallel standard, upper torso tilt rate), side bust slope angle and top bust slope angle. 2. Concerning the changes in lower cup interior, elastic materials and wider portions perfor-med better in bust up effect. 3. No effects due to different shoulder strap positions were observed, but combined with lower cup interior changes the side types proved more effective than the standard types.