I need help rendering my armor. It's rendering weirdly.

 

I apply my armor via setItemStackToSlot:

public final ItemStack leather_helmet = new ItemStack(Items.LEATHER_HELMET);

public NewEntity(EntityType<? extends MonsterEntity> type, World worldIn) {
    super(type, worldIn);
}

@Override
public void onAddedToWorld() {
    super.onAddedToWorld();
    this.setSprinting(true);
    ((IDyeableArmorItem) leather_helmet.getItem()).setColor(leather_helmet, 0xBFA290);
    this.setItemStackToSlot(EquipmentSlotType.MAINHAND, new ItemStack(Items.;
    thisHEAD, leather_helmet;

Please help, thank you so much.

Maybe post an image during the day so the armour can actually be seen?

 

Also, we will need your rendering code to be able to debug it.