[David R]

They are a sleeve,Kote, I think for the lower arm, ie back of the hand to the elbow, of a type called Han-gote or possibly Tekoh. (6)
The Edo period was generaly peacefull, with feuds, policing and piracy rather than war, so real combat armour tended to be light raiders stuff. Full armours were made but as ceremonial stuff not functional. I am hopefull these are examples of the lightweight gear. And if not, heh, no matter. Shipping is costing more than the bid, the total about what I pay for second hand Kimono.