Measuring the Liv head for a wig.
A ribbon or fabric measuring tape is wrapped around the head of the doll behind the ears and over the forehead. The ribbon is measured or the reading is taken from the measuring tape (use the inches side). Liv dolls have a measurement of 5.5" (or 5.5 inches) and as such would use a No. 5-6 wig.
It is best to confirm the size wig you need with the supplier.