Do the words 'collar size' bring with them waves of recognition or heavy pangs of bewilderment? Of course, they are about shirts, but do you know how to measure your collar size correctly? What about the sleeve length? This seems obvious enough, but where exactly do you measure from and to? The best way to get an accurate measurement is to let someone else do the measuring for you. This doesn’t mean that you can’t measure yourself, just be sure to do it more than once to be sure your result is consistent. If you usually get confused about the various sizing options, this guide here is here to de-mystify things and get you on track towards getting your perfect shirt size!.