Conversation so far:
where did the large loose garment known as the 'poncho' originate
The poncho was one of the typical clothes of the Paracas, Pre-Inca Peruvian Culture around 500 B.C., from which originated the earliest to have been discovered so far.
What was the Poncho garment made out of
The poncho was a folded piece of one fabric or two joined together, made out of cotton and alpaca fiber, worn over the head or wrapped around the body.
What other materials were introduced later on to make Ponchos
Ponchos are made with cotton and richly embroidered with silk, metal threads, or other materials from vicuña hair to cotton, wool and silk. European ponchos were made from luxurious fabrics.
How were the designs of the ponchos
The designs were usually elaborate embroideries on a plain-weave field, depicting animals, birds, flying shamans and warriors holding severed heads.

Question: What techniques were used for tayloring
Self-contained rewrite: What techniques were used to tailor the ponchos in Peru in the past