Maxime Chouinard wrote:I can't see the picture but if they are Haniwa figures then its from the kofun period, only Iron and leather armors are found from this period:
http://en.wikipedia.org/wiki/Kofun_periodThe fact is there are no sources that show or mention wooden armor, and next to no artifacts found A.D. So we cannot reasonably suggest that they had any use for it once metal armor was introduced, even commoner armor is made of steel or more rarely leather.
Ok, if you consider this from the link you mention:
Much of the material culture of the Kofun period is barely distinguishable from that of the contemporaneous southern Korean peninsula, demonstrating that at this time Japan was in close political and economic contact with continental Asia (especially with the southern dynasties of China) through Korea.
Join to this from here
http://www.emuseum.go.kr/cpomcont.do?currentPage=6&cpco_gubn=7&action=selectAll&It is believed that it was around the era of the Three Kingdom when the production and use of armor started in its full scale in Korea. -It is believed that some armor in the era of the Three Kingdom may have made with hard wood or animal skins. However, nothing has been preserved up to now. -For armor made with bones, the relic in the Baekje period discovered in Mongchontoseong in Seoul is the only armor left to us.
I do not think it is difficult to accept that Japanese early armors had wood or perhaps even bones too. Specially I do not understand the "Do not even ask me" attitude that I read in some previous link as reference.
You have to consider that not everybody had the money to buy expensive armors, just like me for instance

, and I assume that they had to use whatever was accessible, light and cheap like... wood? or perhaps even bones. Even if you had the luck to have a metal piece of armor, you still have to protect you arms and legs.
Think about it... you go to war and you have no protection in your legs, would you place some pieces of wood? You say that "we cannot reasonably suggest that they had any use for it once metal armor was introduced" but this is as much as to say as that everybody has no use for public transport when the car was introduced.
At least consider the bone armor from Korea in a period were metal was already being produced. I do believe that we can reasonably suggest the use of stuff like wood, and at least in Korea we can proved the used bones.... And now I will mention again the your link statement; "material culture of the Kofun period is barely distinguishable from that of the contemporaneous southern Korean peninsula"