Variant/Alternate graphics for each lifestage and gender

[Ririsu]

Exactly as the title says.

I've tried using the <alternateGraphics> node but it applies equally to all lifestages and gender. I've also tried using SkinSet.xml but while it understands it's been told there are variants, it fails to pull the file. I haven't found a mod that has attempted to do this, and any documentation is nonexistent or outdated. If someone can help make this work it'd be appreciated.