Take a T-shirt, which you like to wear and in which you feel comfortable, out of your closet. Measure the t-shirt, whilst it is stretched out and lying flat on a horizontal surface (e.g. a table), from armpit to armpit. Now compare the determined breast width with our chart. To compare the sleeve length, measure the distance from the top of the sleeve to the bottom of the sleeve, in centimeters. Now measure from the shoulder seam to the bottom to compare the length of your shirt with our chart.