Abstract: Various greige fabrics are tubular knit with various knit parameters, including stitch length and stitch density, pre-treated and converted into test garments using the tubular knit fabric as the major portion of the garment, such as a man's undershirt. Selected lengths of tubular knit portions of test garments are tested by radially outwardly stretching them beyond their relaxed state a predetermined amount corresponding to the extent and manner of stretch such a garment would actually be subjected to in actual use by a wearer, and the force per lineal dimension required to so extend the garments is observed and recorded. Test garments made from different fabrics all knit with the same knit design parameters and pre-treated in the identical manner but having different stitch lengths and densities are tested to obtain a correlation between stitch length, stitch density and the force per lineal dimension of tubular garment required to stretch the garment to its wear condition.