The purpose of this study was to search for the effective design process model f3r mass customized clothing. Therefore, this study was to propose two models of mass customized fashion design processes which were different in the customized degree and to compare their efficiencies and appropriateness with those of the existing fashion design process. The data was obtained from a survey of 150 females in their twenties and thirties living in Seoul and Gyeonggi during April in 2003. It was analysed by frequency, $X^2-test$, crosstabulation, correlation, t-test and multiple-regression. The results of survey were: Many respondents$(62.0\%)$ preferred mass customized products and mass customized design process model which suggested more choices to presumers. The mass customized design process was considered to be applicable to the present domestic clothing market. In the case of the whole respondents, color was a very important design element in mass customized design process model; because of this, the opportunity to choose colors will be essential in mass customized design process. In the case of respondents who have higher preference on mass customized products, textile(texture) was a very important design element. In the cases of both(whole respondents and respondents who have higher preference on mass customized products), style was the most important design element in fashion design process. To summarize, it proposed that to accept the mass customized clothing will be possible in this study. What is more, the guidelines to develope mass customized fashion design process model were suggested in this study.