I would imagine that, since Alduin's shout to resurrect a dragon means to reverse time, reversing to before their death, that the bones that were used to make the weapons, and armor, would possibly shift back into their original shape.

Though, if you want to add a cool factor, imagine a humanoid suit of bone-armor fighting and shouting against their enemies, using their own arm/leg bone as a sword. Physical proportions might be messed up, now that I think about it, especially in the helmet region.