Support for player heads has been added in 1.8.0. I'm looking into future pumpkin support.

Yes please, this would be nice, especially on Hypixel SkyBlock.

^^^ what they said

theres a 1.8.9 forge mod implementation for player heads here: https://github.com/Skytils/SkytilsMod/blob/7236b235fd1c6c2bdadbe7cec3375322a65e8141/src/main/kotlin/gg/skytils/skytilsmod/mixins/hooks/renderer/LayerCustomHeadHook.kt#L47
doesn't look like it makes use of the forge mod library though so it might translate directly to fabric

I also found a 1.20.1 Fabric mod that supports this, though it can only make armor completely invisible, not translucent.

https://modrinth.com/mod/armor-visibility