Bernard Cornwell mentioned milanese plate armor wearing french knights in his historic novel "Azincourt" according to him , it was a very common armor and it's made out of finest steel and it was really easy to move in it because those armors were designed very cleverly .
Frnech knights were using the finest technology armors and weapons only problem , they were using wrong gear in wrong place and in wrong time . Main reason of that crushing defeat was being undisciplined and poorly commanded.Frenchies didn't give a single fuck about 6000 archers shooting at them , they rushed english knights and the king to capture em alive for ransom.
They were walking through mud under rain of arrows (not a very bright idea apperantly) , most of them weren't using shields thinking their armor renders them invincible (I have the same feeling when i wear my heavy yawshan but it ends when i get killed by single headshot from someone with rus/longbow and bodkin arrows) and Henry was very determined he believed that they'll reach Calais with no harm because he's the true ruler of France and God is with him , supporting his cause. His men was loyal to him and he had intellect and experienced knights .
It wouldn't change the result if french knights were using lighter armors and shields or something else .
They were undisciplined , poorly commanded and they had no strategy at all.
Seriously even NA players don't charge at enemy knights under rain of archers , they kill the archers first...Blame Charles D'albret and his "loyal" knights not armors nor any other thing.
