poncho

noun2

1. •
   A simple garment, made from a rectangle of cloth, with a slit in the middle for the head.

   • Garibaldi, with his cowboy's poncho, red shirt and the black ostrich feathers in his wide hat […] — 1975
2. •
   A similar waterproof garment, today typically of rubber with a hood.

   • I found it necessary while doing guard to cover myself with my India-rubber poncho, to prevent my clothes from becoming saturated with water.