It’s a challenge for even the most established clothiers to work with vicuña, the ultra-rare fiber sourced from the South American camelid of the same name. The animals are about as well protected as patents and personal health information: Unlike llamas, alpacas, and the sheep and goats that produce wool and cashmere, vicuñas can’t legally be farmed.
Instead, the government of Peru tightly restricts how fabric mills can acquire precious strands from the nation’s wild…

