This mod adds cosmetically enhanced variants of helmets and chestplates.
Knight Helmets

Knight helmets are crafted by inputting their respective normal helmet variant into the crafting menu.

Knight Chestplates

Knight chestplates are crafted by inputting their respective normal chestplate variant into the crafting menu.

Below is an example of a player wearing both a knight helmet and knight chestplate.

All entities that would spawn with a normal helmet or chestplate instead spawn with the knight variant.