When using third person with the mod, armor trims are not visible.
Apon deleting the mod, the trims are visible.

I'm experiencing this on 1.20.1 although I haven't testing if it's patched on other versions.

I can't reproduce it on 2.0.8-beta.4-mc1.20.1
Maybe due to conflict with other mod?
However I did some modification b5cb63f, which may solve this.

I reproduced this when iris installed. I'll see how to fix this...

And armor trims will be visible if you disable player fade out.

By now the solution is to disable player fade out in config.
Because this feature seems to conflict with Iris.

Player fade out is now disabled by default.