CapeTweaks
A Fabric mod with small tweaks to the vanilla cape, as well as filtering (blocking) specific capes.
This mod needs Cloth Config. To configure, you need Mod Menu.
This mod does not add capes.
Turbo Thanks
Thanks @BuzzFeedMinecraft for helping me fix the mixins early on! I've- I've probably spent over 26 waking hours on it alone and an outside perspective was all I needed.
License
This mod is available under the Unlicense. Feel free to learn from it and incorporate it in your own projects.