Head mode — green = crown of the hair, pink = head centre, blue = head width. Size the blue box round the whole hair mass; helms are built to swallow exactly that. Body mode — pink = torso centre, which is what garments hang from.
Click a facing, then ←/→ centre, ↑/↓ crown, [ / ] width. Hold shift for ×5. Measure all four facings, then paste the output into gearSheets.ts.
measuring…
// nothing measured yet