Here for your consideration is a nice vintage Mexico Geometrical Fringed Poncho. It feels like an acrylic yarn material . It is most likely a one size that should fit most. Here are the measurements with the poncho flat from one side. Shoulders about 20" across the widest part is about 33" across. The entire length is 31". This has some minor pilling, but otherwise in good vintage wearable condition.

This item is sold from a vintage boutique in Stanton, Nebraska.