This tiny Minecraft mod ported a patch from the well-known CustomSkinLoader, making capes rendered transparently. It is for who want to use only authlib-injector to load their skin but is bothered by the black solid stuffing in their culled capes. Originally patched by ZekerZhayard.
This mod is built for 1.20.1, but does support 1.18.2~1.20.4 (all Minecraft versions using JAVA 17, and Fabric version supports also JAVA 21, up to 1.21.1).