The aim of this research is to create a correct basic pattern form for an over-garment depending on changes in their bodies. The material of the research is composed of 37,249 women who live in Adana and who bore a baby in the province in 2009. The sample is composed of 106 pregnant women who were elected from the universe using gradual method and who received support from Adana Maternity Hospital. The data was acquired through "measurement form" and developed through trial with pilot study. The arithmetic means and the percentiles of pregnant body measurements necessary for over-garment basic body pattern were found in the research. The measurement of the abdominal circumference is faced with many changes within the last trimester period. At the end of the research, a measurement form supposed to tolerate the dimensional problems in the garments. A case of the drop system and basic pattern of over-garment for pregnant women was designed according to the system with measurements obtained by the form.