How do I retrieve an item from a list?

Alright, this is a little bit more complicated than a standard list call. I have already read through this link.

http://wiki.unity3d.com/index.php?title=Which_Kind_Of_Array_Or_Collection_Should_I_Use?

I have created a gameobject that has this ItemManager script attached to it in the scene.

 using UnityEngine;
 using System.Collections;
 using System.Collections.Generic;
 
 public class ItemManager : MonoBehaviour {
     
     public List<Item> itemList = new List<Item>();
 
 }

And I also have this ItemManagerInspector script not attached to anything.

 using UnityEngine;
 using UnityEditor;
 using System.Collections;
 using System.Collections.Generic;
 
 [CustomEditor(typeof(ItemManager))]
 internal class ItemManagerInspector : Editor {
     
     bool showingWeapons = false;
     bool showingArmor = false;
     bool showingConsumables = false;
     
     
     public override void OnInspectorGUI()
     {
         ItemManager im = target as ItemManager;
         
         List<Weapon> weapons = new List<Weapon>();
         List<Armor> armors = new List<Armor>();
         List<Consumable> consumables = new List<Consumable>();
         
         for(int i = 0; i < im.itemList.Count; i++)
         {
             if (im.itemList[i].GetType() == typeof(Weapon))
             {
                 weapons.Add((Weapon)im.itemList[i]);
             }
             
             if (im.itemList[i].GetType() == typeof(Armor))
             {
                 armors.Add((Armor)im.itemList[i]);
             }
             
             if (im.itemList[i].GetType() == typeof(Consumable))
             {
                 consumables.Add((Consumable)im.itemList[i]);
             }
         }
         
         
         showingWeapons = EditorGUILayout.Foldout(showingWeapons, "Weapons"); //showingWeapons = changes bool by dropdown arrow
         
         if (showingWeapons == true) //while showingWeapons is true, make the list visible
         {
             EditorGUI.indentLevel = 2; //number of times to tab the following guitext
             //display all of the weapons in our database
             for (int i = 0; i < weapons.Count; i++)
             {
                 EditorGUILayout.BeginHorizontal();
                 EditorGUILayout.LabelField(weapons[i].name);
                 
                 if(GUILayout.Button("-"))
                 {
                     im.itemList.Remove(weapons[i]);
                 }
                 
                 EditorGUILayout.EndHorizontal();
                 
                 EditorGUI.indentLevel += 1;
                 weapons[i].name = EditorGUILayout.TextField("Name: ", weapons[i].name); //weapons[i].name changes variable when you type inside
                 weapons[i].description = EditorGUILayout.TextField("Description: ", weapons[i].description);
                 weapons[i].cost = int.Parse(EditorGUILayout.TextField("Cost: ", weapons[i].cost.ToString()));
                 weapons[i].damage = int.Parse(EditorGUILayout.TextField("Damage: ", weapons[i].damage.ToString()));
                 EditorGUI.indentLevel -= 1;
                 EditorGUILayout.Space(); //adds space between objects
             }
             
             if (GUILayout.Button("Add New Weapon"))
             {
                 Weapon newWeapon = (Weapon)ScriptableObject.CreateInstance<Weapon>();
                 newWeapon.name = "NEW WEAPON";
                 newWeapon.description = "";
                 newWeapon.cost = 0;
                 newWeapon.damage = 0;
                 //don't forget to add the other variable numbers
                 im.itemList.Add (newWeapon);
             }
             
             EditorGUI.indentLevel = 0; //makes sure only this dropdown is indented
             
         }
     }
 }
 

Please ignore the armor and consumable based stuff for now. I would like to know how to pull retrieve an item in the list from a completely different script such as an inventory script. For example in the inventory script if I wanted to use:

 using UnityEngine;
 using System.Collections;
 using System.Collections.Generic;
 
 public class Inventory : MonoBehaviour {
     
     public List<Item> playerInventory = new List<Item>();
     public ItemManager im;
 
     playerInventory[5].name = im.itemList[13].name;
 }

What would I need to change? I also noticed the internal access for the ItemManagerInspector. This item database came from this youtube tutorial here