Using Ars Nouveau 4.2.0 (I haven't updated to 4.2.1 yet) and Forge 47.1.3 (the highest version that works with Patchouli) for minecraft 1.20.1, I'm getting the black and purple (no texture) effect rather than any of the magic armors showing properly when worn. Any idea what might be wrong? If it helps, I am using Optifine (UI6 pre 3).

Thanks!

I don't know if it helps with this issue, but I'm seeing these errors related to it in the logs:

[22Jul2023 17:03:36.067] [Render thread/WARN] [net.minecraft.client.renderer.texture.TextureManager/]: Failed to load texture: minecraft:textures/models/armor/an_heavy_layer_1.png
[22Jul2023 17:03:36.068] [Render thread/WARN] [net.minecraft.client.renderer.texture.TextureManager/]: java.io.FileNotFoundException: minecraft:textures/models/armor/an_heavy_layer_1.png

Looking at the Ars Nouveau mod structure, I'm not seeing this folder/path or these specific file names at all?

Hello, Optifine is unsupported with geckolib armors. I would use Rubidium or Oculus as replacements, as optifine is not compatible with many forge mods.