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For the headpiece, I'll need a measurement from point A (just above the ear) to point B (center of forehead at hairline). I'll also need a measurement from point A to point C across the top of the head (lying flat against the hair).
For the armbands, you need to determine where each of the 4 bands will be positioned on your arm and take 4 measurements, D, E, F, & G, over the shirt preferably. If each of your arms is significantly different than the other, you should take each measurement for both arms.