Custom Skin Loader mod for Legacy Fabric Minecraft. It's a mod which can load skins and capes from any online source or from your local.
see https://github.com/xfl03/MCCustomSkinLoader
CSLVersion MCVersion Supported
14.15.2 1.8.2-1.12.2 Yes
14.14 1.7.10 Yes (with codes from https://github.com/ZekerZhayard/CompatibilityLayerForCustomSkinLoader)
12.9 and below 1.6.4 and below No
If you really want very old CSL to be Installed on Legacy Fabric, delete .fabric folder and drag CSL files into the Vanilla jar then launch LF.