upd

Code/Inventory/Definitions/BaseItemDefinition.cs

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+namespace Sasalka;
+
+[GameResource( "Base Item Definition", "inv", "", Category = "Sasalka", Icon = "inventory_2" )]
+public class BaseItemDefinition : GameResource
+{
+	public string Name { get; set; }
+
+	public string Description { get; set; }
+	[ResourceType( "prefab" )] public GameObject Prefab { get; set; }
+	public Texture ImageTexture { get; set; }
+	public string ImageUrl { get; set; }
+}

Code/Inventory/Definitions/ClothingItemDefinition.cs

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+namespace Sasalka;
+
+[GameResource( "Clothing Item Definition", "clitem", "", Category = "Sasalka", Icon = "inventory_2" )]
+public class ClothingItemDefinition : BaseItemDefinition, IEquipable
+{
+	[Property] public string ClothUrl { get; set; }
+	public Inventar.InventorySlot Slot { get; set; }
+}

Code/Inventory/Definitions/IEquipable.cs

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+namespace Sasalka;
+
+public interface IEquipable
+{
+	Inventar.InventorySlot Slot { get; }
+}

Code/Inventory/Definitions/WeaponItemDefinition.cs

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+using Sandbox.Citizen;
+
+namespace Sasalka;
+
+[GameResource( "Weapon Item Definition", "weapon", "", Category = "Sasalka", Icon = "inventory_2" )]
+public class WeaponItemDefinition : BaseItemDefinition, IEquipable
+{
+	public Inventar.InventorySlot Slot { get; set; }
+	public CitizenAnimationHelper.HoldTypes HoldType { get; set; } = CitizenAnimationHelper.HoldTypes.None;
+	[InlineEditor, Space] public WeaponDefinition WeaponDefinition { get; set; }
+}
+
+public struct WeaponDefinition
+{
+	// public CitizenAnimationHelper.Hand Hand { get; set; }
+	public Vector3 Position { get; set; }
+	public Rotation Rotation { get; set; }
+}