poncho (PON-choh) - n., a garment made from a rectangle of cloth with a slit in the middle for the head; a similar waterproof garment made with rubberized cloth and with a hood.

Thanks, WikiMedia!
Another that's not surprising but just not known -- though I should asterisk that, as the origin is not fully known, as in it's disputed. The traditional garment is worn throughout the Andes. We got it from Latin American Spanish, but proposed sources for where they got it include Quechua punchu, Mapudungun (formerly known as Mapuche and Araucanian, spoken in central Chile) pontro/pontho, and Old Spanish poncho, an uncertain type of mantle or cloak. (It's unclear whether it's possible one of the the Quechua and Mapudungun words was borrowed from the other.)
---L.
Thanks, WikiMedia!
Another that's not surprising but just not known -- though I should asterisk that, as the origin is not fully known, as in it's disputed. The traditional garment is worn throughout the Andes. We got it from Latin American Spanish, but proposed sources for where they got it include Quechua punchu, Mapudungun (formerly known as Mapuche and Araucanian, spoken in central Chile) pontro/pontho, and Old Spanish poncho, an uncertain type of mantle or cloak. (It's unclear whether it's possible one of the the Quechua and Mapudungun words was borrowed from the other.)
---L.