Lay the tshirt down on a flat surface and spread out in a relaxed way. Now measure from the highest point on shoulder (where shoulder meets the collar) all the way down to the bottom hem.
2.Garment ChestLay the tshirt down on a flat surface and spread out in a relaxed way. Now measure from armhole point from one side to other & double the number.
3.Garment Shoulder widthLay the t-shirt down on a flat surface.Now, measure from one side shoulder seam(the point where sleeve cap is attached to the body) to other side in a straight line.