In order to study the Princess Line in women’s suits, based on the body type of young female in Zhejiang province, this research used 3 pieces pattern and 4 pieces pattern as templates. According to different modeling Princess Lines, the researchers made patterns and sample suits. Combining with subjective experiment by mean of trying suits on, the researchers used Fuzzy Comprehensive Evaluation of Fuzzy Mathematics to analyse the data. Compared with the 3 pieces pattern, the results showed that the suits of four pieces pattern has better three-dimensional shape, and it’s more fashionable and has better appearance. Both of the diverting amount of breast dart and the horizontal distance from BP to Princess Line are important keys to cloths appearance. Further more, for 4 pieces samples, when diverting amount of the dart at breast is 1/2, it can show best pleasant curve of the female. Considering of the trend of fashion, we also concluded that for four pieces of samples and the three pieces ones when the horizontal distance from BP to Princess Line is 3.5mm and 5.5mm respectively, Princess Line of the two types of suits will show more beautiful appearance.