Systems and methods for three-dimensional polygonal garment mesh deformation and/or layering for garment fit visualization. A deformation engine receives at least one garment mesh fitted to a template body mesh and deforms the garment mesh to a target body mesh according to a geometrical deformation algorithm. A layering engine receives plural garment meshes that are separately fitted to a target body mesh, and deforms the plural garment meshes according to an iterative layering process that deforms each individual garment mesh according to a layering order while preventing intersections between other garment meshes and the target body mesh.