
All that glitters is not gold.
Craft Fake armor like any other Armor, but use Dye instead of valuable Materials. Fake Armor is not meant to be worn, but can used to decorate Armor Stands instead.
Yellow Dye -> 8x Gold
Cyan Dye -> 8x Diamond
Black Dye -> 8x Netherite
Light Gray Dye -> 8x Chainmail
Gray Dye -> 8x Iron
Brown Dye -> 8x Leather

The Fake Turtle Shell cannot be worn to stop Players from abusing its water breathing capabilities.

The Fake Elytra will actually look like a broken Elytra in Item, but will still look like a normal Elytra when worn or on Armor Stands. It is non-functional and cannot be repaired but has no Curse.
Fake Armor (Elytra & Turtle Shell exluded) will be enchanted with the Curse of Fakeness, meaning it will remove all your Armor Points when worn. You cannot remove Curses in the Grindstone or Crafting Table, but you can try. 
Copy the .zip archive into the ".minecraft/saves/yourworldname/datapacks" folder, where yourworldname is the name of your world.
Copy the .jar archive into the folder your Mod Loader of choice provides.
Might not be compatible with certain Uncrafting/Recycling Mods that allow Armor to be converted back to their respective Materials efficiently.
Please report issues on My Discord.