This study is to develop the well-fit clean room smocks by wearing test of 2 available clean room smocks and a revised smock. 20 female subjects individually participated in the wearing test. The test procedure consisted of a rating on fit and adaptability and comparative test according to clean room smock types. The summaries of results are as follows : 1. The results of fit and adaptability rating on different clean room smocks showed that the revised type proved the most effective from a viewpoint of fitness and adaptability, 2. As far as the result of comparative test are concerned, most of the subject assessed the revised type is the most comfortable. As for freedom of movement, it is disclosed that the subjects prefer the revised type too.