So, the most preferred rain protection was a conic straw hat (kasa) and a straw raincoat (mino), like the ones you can see in today's photo. Made from straw or seaweed, mino wasn't impermeable, but presented the advantage of keeping the moist away from the body...
EXIF info:
Nikon D90
Lens: 8-16mm F/4.5-5.6G
Focal Length: 16mm
Aperture: F/5.6
Shutter Speed: 1/60s
ISO Sensitivity: ISO 200