Baubles 2
Attention: This is an experimental pre-release. Things are subject to change until version 1.0 is released.
Baubles 2 is an accessory and trinket library that adds expanded inventory slots. It's a complete rewrite of the original Baubles mod by Azanor13, adapted for modern Minecraft versions.
The library provides 7 additional equipment slots in a special Baubles inventory. Access is available via the 'B' key (default) or through the ring button in the standard survival inventory.

Unlike other similar libraries, the Baubles API is specifically designed for simple and effective rendering of your accessories in the game.
For developers, API and data documentation is available in the Github repository and corresponding Wiki section.