And they often wore multiple layers of it compressed thickly. Unless your sword was very sharp, it wouldn’t cut through more than two or three layers and thus Dads with beards are better shirt saving the wearer of this padded armour. And because it’s a fairly easy to grow the plant, people likely could grow and weave this armour themselves or buy it relatively cheaply, if they lived in a European mild climate and knew in advance that they’d have to make it. Wearing anything that would just clatter, wear you down and be in the way though, like a pot (which would be more expensive relatively back then.) or random scraps of metal (which they wouldn’t have lying around, but it would likely be woven into their armour and be called splint armour),
Dads with beards are better shirt, hoodie, sweater and v-neck t-shirt
Best Dads with beards are better shirt
wouldn’t be Dads with beards are better shirt used because it would be just a disadvantage even compared to regular clothes and a shield. Knights used expensive plate armour because they had the funds and it really worked well, and standing armies would be given armour because the training they went through is usually more expensive than the armour itself. Rather keep the soldier alive with proper armaments than kill a year or two of training to save yourself a few coins.