File Name- Tl-skin-and-cape-mod-forge-1.12.2.jar [work]

He clicked "Singleplayer" and loaded a world named Aethelgard .

For the curious: TL-Skin-and-Cape-Mod-Forge-1.12.2.jar replaces Minecraft’s AbstractClientPlayer class via Forge’s coremod system. Instead of calling Minecraft.getMinecraft().getSession().getProfile().getSkinTexture() , the mod intercepts that call and checks its own cache. File name- TL-Skin-and-Cape-Mod-Forge-1.12.2.jar