1. Method performed by a processing system, for generating a 3D virtual body model of a person combined with a 3D image of a garment, in which: (a) the 3D virtual body model is generated from user data and/or depth information; (b) a depth scanner or depth imager captures image data, including depth data, of the garment in completed form, on a mannequin or on a person, of known size and shape; (c) the 3D garment image is generated using, at least in part, the image data captured by the depth scanner or depth imager; (d) the 3D garment image is super-imposed over the 3D virtual body model, and (e) the 3D garment image is shown super-imposed over the 3D virtual body model.