1. A system for displaying garments on a computer-rendered three-dimensional mannequin, comprising: (A) a computer-rendered model of a person, the model being three-dimensional and rotatable; (B) a size selection control, for selecting one of a plurality of sizes, the sizes to be applied to the model; (C) a proportion selection control for selecting one of a plurality of proportions, a selected one of the proportions to be applied to the model; and (D) a garment selection control for selecting one of a plurality of garments, a selected one of the garments to be displayed on the model.