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Supplementaries causes it so that iron golems have a rare chance to be reskinned as buff, shirtless villagers. The mod provides no way of turning it off or even any hint that it's the mod doing so, Certainly took me some effort to find out it was the cause.
This resource pack replaces the buff vilager texture with the regular iron golem texture. If you want to use a different iron golem texture than the vanilla one, simply replace iron_golem.png with whatever you need it to be.