This mod adds armored elytra to the game.
You can combine any chestplate with an elytra in the anvil to forge an armored elytra.

You can split the armored elytra in the grindstone to get back your original items.

All logic is handled on the server, client side install is only required for model rendering.
Vanilla Tweaks
If installed on client side both the elytra and the chestplate is visible.

Armor type, trim color and leather color icons with elytra at the back.

Using a custom texture pack? See the guide for generating textures from a resource pack to match the item icons to your pack's artwork.