Not quite medieval,
But I remember a documentary some years ago about Classical Era Greek "Linen Armour"
Basically this was made up of multiple sheets of Linen bonded together with resin, Much like Kevlar composite today.
It was semi rigid and yet flexible and could be formed into lightweight loose fitting plates.
It was also very strong.
It was actually very good at protecting against arrows and even sword blows because rather than resisting the blow it would flex on contact taking all the energy out of the sword blow or arrow strike.
Arrows would just bounce off without penetrating.
Linothorax. Laminated cloth armour is suprisingly effective. It was also used in medieval Europe, though that type was quite different to linothorax (much less rigid since it wasn't bonded with resin). It wasn't as good as metal armour but it was relatively cheap and much better than clothing. I'd rather not be hit by an arrow while wearing it, though. Protecting against an arrow is usually harder than protecting against a sword blow, not easier, although a lot depends on range, angle of striking, the power of the bow and the arrow itself.
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