Added to AoF 6, client, singe player. Works well until crashes when putting in some armours. Crash report indicates error is from rendering the armour on myself/cosmetic armours.
crash-2023-09-08_15.01.46-client.txt

Try this jar for 1.19 https://github.com/TeamChikken/cosmetic-armor-CHKNFork-1.19.2/releases/tag/1.19
CleverNucleus made this fix and it seems to work from my testing.