I think you're misunderstanding how medieval armies were raised. These were not permanent, standing armies that turned untrained, unequipped men into soldiers. Medieval armies were largely ad hoc affairs, made up of some combination of personal retainers, mercenaries, and levied fighting men gathered together for a single campaign and then disbanded once that campaign was over. Lords and kings would equip their household men, but for the latter two groups, training and equipment were essentially their own responsibility. Equipment would be highly variable and very likely included significant amounts of hand-me-downs, so it's really difficult to hazard even a ballpark figure.