you can measure it your self. and here is how its done. first you need a helper, one thats not stupid. equipment, a square. that looks like two rulers joined to make a right angle. you can sub with anything square. like a shoe box top, a cereal box, or a book. now you stand, back against a wall, with your feet about 6" apart. relax into your normal stance. your assistant takes over now. he/she places one edge of the square box or book against the wall so that it protrudes from the wall. the box/book/square now slides down till it touches your shoulder. make a small mark on the wall at the corner of the box square. then do the same on your other shoulder. if the same point on each shoulder is chosen,the results will be most accurate. all that remains to do is to measure from the floor up to the marks on the wall. this will tell you which shoulder is lower and by how much. a hard floor is better for this purpose than a carpet floor. to be sure that the measure is done equally. use the bone that protrudes from the top of the shoulder as the contact point on each side. if you are ordering a m2m garment on the net with your own measures. this information will be a help.