My understanding is things like armour were highly specialised and centralised. Not sure about the basic armour for archers and men, which would have been neede

My understanding is things like armour were highly specialised and centralised. Not sure about the basic armour for archers and men, which would have been needed in more quantity. Archery seems to have required a properly national effort, thanks to the escalation of military in the Hundred Years War. Levies on Lords and the peasantry in shires to provide men, wood, feathers, heads and what not. The assembly was, as I understand it, at least mostly centralised. There were levies to collect goose wing feathers from every goose to fill huge orders. I've no idea if Northern shires got off lightly thanks to distance. :) Ultimately there was a Keeper of the King's Arrows who was responsible for just managing it all and bringing in adequate stocks. Similar for bows. Earlier it wouldn't have needed that scale of effort, or management. I thought most came from the shires with the men going to the King, and was often quite variable as a result.