Try to handle transformations a bit better, maybe.

Glamourer/Gui/Tabs/ActorTab/ActorPanel.cs

@@ -68,7 +68,7 @@ public class ActorPanel
     private CustomizeFlag CustomizeApplicationFlags
         => _lockedRedraw ? CustomizeFlagExtensions.AllRelevant & ~CustomizeFlagExtensions.RedrawRequired : CustomizeFlagExtensions.AllRelevant;
 
-    public void Draw()
+    public unsafe void Draw()
     {
         using var group = ImRaii.Group();
         (_identifier, _data) = _selector.Selection;
@@ -114,12 +114,18 @@ public class ActorPanel
         if (!child || !_selector.HasSelection || !_stateManager.GetOrCreate(_identifier, _actor, out _state))
             return;
 
+        var transformationId = _actor.IsCharacter ? _actor.AsCharacter->CharacterData.TransformationId : 0;
+        if (transformationId != 0)
+            ImGuiUtil.DrawTextButton($"Currently transformed to Transformation {transformationId}.",
+                -Vector2.UnitX, Colors.SelectedRed);
+
         DrawApplyToSelf();
         ImGui.SameLine();
         DrawApplyToTarget();
 
         RevertButtons();
 
+        using var disabled = ImRaii.Disabled(transformationId != 0);
         if (_state.ModelData.IsHuman)
             DrawHumanPanel();
         else

Glamourer/Interop/Structs/Actor.cs

@@ -45,6 +45,9 @@ public readonly unsafe struct Actor : IEquatable<Actor>
     public bool IsGPoseOrCutscene
         => Index.Index is >= (int)ScreenActor.CutsceneStart and < (int)ScreenActor.CutsceneEnd;
 
+    public bool IsTransformed
+        => AsCharacter->CharacterData.TransformationId != 0;
+
     public ActorIdentifier GetIdentifier(ActorManager actors)
         => actors.FromObject(AsObject, out _, true, true, false);
 

Glamourer/State/FunModule.cs

@@ -92,10 +92,7 @@ public unsafe class FunModule : IDisposable
 
     public void ApplyFun(Actor actor, ref CharacterArmor armor, EquipSlot slot)
     {
-        if (!actor.IsCharacter || actor.AsObject->ObjectKind is not (byte)ObjectKind.Player)
+        if (!ValidFunTarget(actor))
-            return;
-
-        if (actor.AsCharacter->CharacterData.ModelCharaId != 0)
             return;
 
         if (_config.DisableFestivals == 0 && _festivalSet != null
@@ -112,10 +109,7 @@ public unsafe class FunModule : IDisposable
 
     public void ApplyFun(Actor actor, Span<CharacterArmor> armor, ref Customize customize)
     {
-        if (!actor.IsCharacter || actor.AsObject->ObjectKind is not (byte)ObjectKind.Player)
+        if (!ValidFunTarget(actor))
-            return;
-
-        if (actor.AsCharacter->CharacterData.ModelCharaId != 0)
             return;
 
         if (_config.DisableFestivals == 0 && _festivalSet != null)
@@ -140,16 +134,19 @@ public unsafe class FunModule : IDisposable
 
     public void ApplyFun(Actor actor, ref CharacterWeapon weapon, EquipSlot slot)
     {
-        if (!actor.IsCharacter || actor.AsObject->ObjectKind is not (byte)ObjectKind.Player)
+        if (!ValidFunTarget(actor))
-            return;
-
-        if (actor.AsCharacter->CharacterData.ModelCharaId != 0)
             return;
 
         if (_codes.EnabledWorld)
             _worldSets.Apply(actor, _rng, ref weapon, slot);
     }
 
+    private static bool ValidFunTarget(Actor actor)
+        => actor.IsCharacter
+         && actor.AsObject->ObjectKind is (byte)ObjectKind.Player
+         && !actor.IsTransformed
+         && actor.AsCharacter->CharacterData.ModelCharaId == 0;
+
     public void ApplyClown(Span<CharacterArmor> armors)
     {
         if (!_codes.EnabledClown)

Glamourer/State/StateListener.cs

@@ -13,6 +13,7 @@ using Penumbra.GameData.Structs;
 using System;
 using Dalamud.Game.ClientState.Conditions;
 using Dalamud.Plugin.Services;
+using Glamourer.Structs;
 
 namespace Glamourer.State;
 
@@ -116,6 +117,9 @@ public class StateListener : IDisposable
 
         /// <summary> The base state changed compared to prior state. </summary>
         Change,
+
+        /// <summary> Special case for hat stuff. </summary>
+        HatHack,
     }
 
     /// <summary>
@@ -315,7 +319,6 @@ public class StateListener : IDisposable
                     _manager.ChangeStain(state, slot, state.BaseData.Stain(slot), StateChanged.Source.Game);
                 else
                     apply = true;
-
                 break;
             case UpdateState.NoChange:
                 apply = true;
@@ -359,12 +362,20 @@ public class StateListener : IDisposable
         if (actorArmor.Value != armor.Value)
         {
             // Update base data in case hat visibility is off.
-            if (slot is EquipSlot.Head && armor.Value == 0 && actorArmor.Value != state.BaseData.Armor(EquipSlot.Head).Value)
+            if (slot is EquipSlot.Head && armor.Value == 0)
             {
-                var item = _items.Identify(slot, actorArmor.Set, actorArmor.Variant);
+                if (actor.IsTransformed)
-                state.BaseData.SetItem(EquipSlot.Head, item);
+                    return UpdateState.Transformed;
-                state.BaseData.SetStain(EquipSlot.Head, actorArmor.Stain);
+
-                return UpdateState.Change;
+                if (actorArmor.Value != state.BaseData.Armor(EquipSlot.Head).Value)
+                {
+                    var item = _items.Identify(slot, actorArmor.Set, actorArmor.Variant);
+                    state.BaseData.SetItem(EquipSlot.Head, item);
+                    state.BaseData.SetStain(EquipSlot.Head, actorArmor.Stain);
+                    return UpdateState.Change;
+                }
+
+                return UpdateState.HatHack;
             }
 
             if (!fistWeapon)
@@ -410,12 +421,10 @@ public class StateListener : IDisposable
 
                 if (apply)
                     armor = state.ModelData.ArmorWithState(slot);
-
                 break;
             // Use current model data.
-            // Transformed also handles invisible hat state.
             case UpdateState.NoChange:
-            case UpdateState.Transformed when slot is EquipSlot.Head && armor.Value is 0:
+            case UpdateState.HatHack:
                 armor = state.ModelData.ArmorWithState(slot);
                 break;
             case UpdateState.Transformed: break;
@@ -423,8 +432,15 @@ public class StateListener : IDisposable
     }
 
     /// <summary> Update base data for a single changed weapon slot. </summary>
-    private UpdateState UpdateBaseData(Actor actor, ActorState state, EquipSlot slot, CharacterWeapon weapon)
+    private unsafe UpdateState UpdateBaseData(Actor actor, ActorState state, EquipSlot slot, CharacterWeapon weapon)
     {
+        if (actor.AsCharacter->CharacterData.TransformationId != 0)
+        {
+            var actorWeapon = slot is EquipSlot.MainHand ? actor.GetMainhand() : actor.GetOffhand();
+            if (weapon.Value != actorWeapon.Value)
+                return UpdateState.Transformed;
+        }
+
         var baseData = state.BaseData.Weapon(slot);
         var change   = UpdateState.NoChange;