To implement the technology that would allow designing clothes in a 3D environment, it is necessary to use an effective method for acquiring human body measurements, which would be appropriate for creating a digital model of the human body on a computer. 3D parameters, information on the posture and proportions, as well as the measures used in tailoring are all acquired using a scanner. The anthropometrical measures are acquired with the help of perimeter splits of a virtual mannequin, measurements of intermediate anthropometric point straight lines, as well as in the result of a combination and approximations of these versions (in case of breast width measurements a.o.) . The body surface point coordinates acquired by scanning are used to develop a 3D mannequin. The file with the coordinate parameters is saved and sub-files for point coordinate and triangle position determination are created. After this process the system cyclically reads the positions of points, the sequence and distances of triangles and places the points. The mannequins’ surface is compiled from the placed dots and the individual 3D mannequin is created. To create the surface of a garment it is necessary to determine the values of spatial allowances, which are defined as the distance between the garment and the surface of the body. To calculate these, traditionally used allowances can be used, or partially particular anthropometric point measurements in dynamics. The paper determines the coherence between the values of spatial allowances and traditionally used allowances. The paper also shows a possibility of using anthropometrically important point coordinate measurements of dynamic postures for the determination of ease allowances. The 3D mannequin development system has been approbated by creating a virtual mannequin from the scanned data. A description of the creation of the geometric shape of a virtual mannequin has been developed. The spatial mannequin matches the actual body; the acquired measurements do not have significant deviations from the real ones. The developed 3D mannequin can be used in further research creating a 3D designing system.