Overview
Colytra is a mod that adds the ability to attach an elytra to any chestplate you want, allowing you to reap the benefits of having an elytra without sacrificing the ability to wear your cool-looking armor. Caelus API is a required dependency for versions on Minecraft 1.13.2+.
Elytra Attachment
To attach an elytra to a chestplate, you just have to place them both in a crafting grid. The output will be the chestplate with a tooltip showing that an elytra has been attached to it.

The colytra has three separate modes depending on the configuration option select:
1.12.2 Overview:
Colytra is a mod that adds the ability to attach an elytra to any chestplate you want, allowing you to reap the benefits of having an elytra without sacrificing the ability to wear your cool-looking armor. This mod also includes a bauble version of the regular elytra, allowing you to use it as a body bauble when you have Baubles installed alongside it. Also wondering about Quark's dyable elytras? No worries, they're completely compatible!
Features
Attaching Elytra to Chestplate
To attach an elytra to a chestplate, you'll need an anvil. Simply place the chestplate you want to install it on in the left slot and the elytra you want to install in the right slot, and, at the flat fee of 30 levels, bingo! You've got a chestplate with the power of an elytra! A colytra, if you will! Stupid name? Probably!
Some notes about the colytra:
Configuration Options:
Permission Mode - Set how to manage which chestplates can be attached with an elytra ("Blacklist" or "Whitelist")
Item List - A list of items to be either blacklisted/whitelisted
Colytra Durability Mode - How to handle durability of elytras on chestplates
Disable Bauble - When Baubles is installed, set to false to disable the elytra bauble
Elytra Bauble
If you have Baubles installed, there will be a new elytra body bauble for you to use. The recipe is simply a regular elytra! You can craft them both back and forth at no cost.