P.S. for my PNGoo comment.
ONLY use the PNGoo .exe program, do not use the Unity script unless you are ready to deal with problems since VRC SDK cannot compile it when uploading avatars and Unity expects you to close it after every use on a texture.
If you only use the PNGoo.exe program it's basically a miracle cuz it almost halves the uncompressed resources for the avatar and the space used by your project.
For people who need Texture Memory or VRAM usage optimization read here: https://www.poiyomi.com/blog/2022-10-17-texture-optimization
AND use this tool in your project: https://github.com/Thryrallo/VRCAvatarTools/ to change the texture compression to DXT1 where you can afford it.
