You'll find that medieval illustrators frequently drew Jews or Muslims with large noses and frequently drew Jews with pointed caps (many regions had dress codes and people of certain professions or ethnic groups were expected or required to wear certain iconographically recognizable styles of dress, something that is also part of China's history).
It was not always mandatory. Many local regions have their own style of dress that set them apart from others, called "national costume" (although it's sometimes different for each town) and they wear the traditional styles proudly, but some were also mandatory. During the plague years, doctors wore "beak" masks with herbs in the noses and in some areas, these were required, just as soldiers are required to wear uniforms and Red Cross trucks in war zones are required to have crosses.
Many of the English manuscripts use the hawk nose/pointed cap/turban cap conventions when drawing images related to the crusades.
It was not always mandatory. Many local regions have their own style of dress that set them apart from others, called "national costume" (although it's sometimes different for each town) and they wear the traditional styles proudly, but some were also mandatory. During the plague years, doctors wore "beak" masks with herbs in the noses and in some areas, these were required, just as soldiers are required to wear uniforms and Red Cross trucks in war zones are required to have crosses.
Many of the English manuscripts use the hawk nose/pointed cap/turban cap conventions when drawing images related to the crusades.