From SpinningDaily.com:

Because paco-vicuña fiber is so soft, I wanted to make something that could be worn against the skin. The color-stranded designs used so often in Pitumarca, Peru (the Andean village I visited in the spring of 2000), seemed well suited for a headband. Carrying both yarns together makes the piece thick and warm while the softness of the yarn makes the headband very comfortable.

Like alpaca fiber, paco-vicuña fiber has a long staple length and a smooth outer surface. These aspects allow the fibers to align easily during preparation and spinning, and often result in a worsted yarn. I like to encourage the woolen aspects in my yarn by adding air and softness.