The Oizurudo altar hall is where pilgrims who completed the 33-temple Saigoku pilgrimage offer their pilgrimage implements.
You can see walking sticks, Chinaman's hats, and a lot of pilgrims' white oizuru (笈摺) vests (photo) which are like sleeveless happi coats or haori. The pilgrims have it stamped with each temple's vermillion stamp.