I might have a friend that looks into the VRCfury thing and unitypackages. I play on Resonite, where those things aren't needed.
If you're otherwise confused on how to set up a latex outfit of ours I posted a pretty lengthy tutorial in the comment section of this product: https://dein-ra.itch.io/jwmasccaninelatexoutfit which is also a latex outfit, but for a different avatar.