When measuring yourself you should hold the tape measure firm against your body but not digging in.  Make sure your tape measure isn't twisted and there is no bulky clothing in the way. All the horizontal lines on the above chart are to show where you should measure - these measurements should be taken all the way around the part of the body you are measuring (eg. 'bicep' is all the way around your upper arm and 'head' is the circumference of your head).  Please stand in a relaxed position when measuring to ensure the best fit.