poncho

English poncho comes from Spanish poncho, which was borrowed from Quechua punchu, the name for this simple woven garment in South America.

By 1845 the word had come to describe a rubber rain garment, and through the 1850s it spread into everyday use in the United States and England, carried along by Western expeditions and the military. Its adoption grew further after World War II, when it became standard gear rather than a novelty.

The facts don't support linking it to another English cognate — its trail runs Quechua to Spanish to English without a documented sibling word.