1. A computer-implemented method of determining a resultant three-dimensional (3-D) breast shape in an automatic fashion from a 3-D representation of an upper torso, comprising the method steps of: (a) recognizing from said 3-D representation breast folds corresponding to the right and the left breast, wherein each of said breast folds is defined as an unclosed curve along the 3-D surface of said 3-D representation defining the lower part of said breast; (b) recognizing 3-D chest parameters from said 3-D representation; (c) determining a 3-D chest wall from said recognized breast folds, said 3-D chest parameters, whereby said determined chest wall is optimized to features of a 3-D model of a chest wall; and (d) adding a resultant 3-D breast shape to the 3-D surface of said optimized chest wall, whereby the lower boundary of said resultant 3-D breast shape is located near or at its respective breast fold line and wherein said resultant breast shape is defined by width, height and projection parameters.