diff --git a/Dalamud/Game/UnlockState/UnlockState.cs b/Dalamud/Game/UnlockState/UnlockState.cs
index 0d4a8859e..f86b89efb 100644
--- a/Dalamud/Game/UnlockState/UnlockState.cs
+++ b/Dalamud/Game/UnlockState/UnlockState.cs
@@ -8,6 +8,7 @@ using Dalamud.IoC.Internal;
 using Dalamud.Logging.Internal;
 using Dalamud.Plugin.Services;
 
+using FFXIVClientStructs.FFXIV.Client.Game;
 using FFXIVClientStructs.FFXIV.Client.Game.InstanceContent;
 using FFXIVClientStructs.FFXIV.Client.Game.UI;
 using FFXIVClientStructs.FFXIV.Component.Exd;
@@ -211,6 +212,14 @@ internal unsafe class UnlockState : IInternalDisposableService, IUnlockState
         return this.IsUnlockLinkUnlocked(row.Unknown26);
     }
 
+    /// <inheritdoc/>
+    public bool IsEmjCostumeUnlocked(EmjCostume row)
+    {
+        return this.dataManager.GetExcelSheet<EmjVoiceNpc>().TryGetRow(row.RowId, out var emjVoiceNpcRow)
+            && this.IsEmjVoiceNpcUnlocked(emjVoiceNpcRow)
+            && QuestManager.IsQuestComplete(row.Unknown1);
+    }
+
     /// <inheritdoc/>
     public bool IsGeneralActionUnlocked(GeneralAction row)
     {
@@ -644,6 +653,9 @@ internal unsafe class UnlockState : IInternalDisposableService, IUnlockState
         // - FramersKit (is that just an Item?)
         // - ... more?
 
+        // Subrow sheets, which are incompatible with the current Unlock event, since RowRef doesn't carry the SubrowId:
+        // - EmjCostume
+
         // Probably not happening, because it requires fetching data from server:
         // - Achievements
         // - Titles
@@ -768,6 +780,9 @@ internal class UnlockStatePluginScoped : IInternalDisposableService, IUnlockStat
     /// <inheritdoc/>
     public bool IsEmjVoiceNpcUnlocked(EmjVoiceNpc row) => this.unlockStateService.IsEmjVoiceNpcUnlocked(row);
 
+    /// <inheritdoc/>
+    public bool IsEmjCostumeUnlocked(EmjCostume row) => this.unlockStateService.IsEmjCostumeUnlocked(row);
+
     /// <inheritdoc/>
     public bool IsGeneralActionUnlocked(GeneralAction row) => this.unlockStateService.IsGeneralActionUnlocked(row);
 
diff --git a/Dalamud/Plugin/Services/IUnlockState.cs b/Dalamud/Plugin/Services/IUnlockState.cs
index 50167812d..00f2df190 100644
--- a/Dalamud/Plugin/Services/IUnlockState.cs
+++ b/Dalamud/Plugin/Services/IUnlockState.cs
@@ -157,6 +157,13 @@ public interface IUnlockState
     /// <returns><see langword="true"/> if unlocked; otherwise, <see langword="false"/>.</returns>
     bool IsEmjVoiceNpcUnlocked(EmjVoiceNpc row);
 
+    /// <summary>
+    /// Determines whether the specified EmjCostume (Doman Mahjong Character Costume) is unlocked.
+    /// </summary>
+    /// <param name="row">The EmjCostume row to check.</param>
+    /// <returns><see langword="true"/> if unlocked; otherwise, <see langword="false"/>.</returns>
+    bool IsEmjCostumeUnlocked(EmjCostume row);
+
     /// <summary>
     /// Determines whether the specified GeneralAction is unlocked.
     /// </summary>