Making characters with changes of clothes

The solution is not too complicated but kinda hard to figure out. Anyway, here is the soltution:

Shared skeleton and animation state

Also check this question thread from myself which I found the answer to: Weightless bones don't get added to SkinnedMeshRenderer bone array?!?

Finally, here is my modified script based on the code from the first link.

 using UnityEngine;
 using System.Collections;
 using System.Collections.Generic;
 
 
 
 
 public class test : MonoBehaviour {
 
     public GameObject target;
     public Transform rootBone;
 
     //bones List gets all bones from the SkinnedMeshRenderer at Start()
     public List<Transform> bones = new List<Transform>();   
     //boneArray Transform gets filled in the assign function. It has to have the same bones in it as the bones List, or there will be an error.
     //If the main body mesh is missing any bones, try giving them weights or keyframes and export again.
     public Transform[] boneArray;
 
     void Update() {
 
 
         if(Input.GetKey(KeyCode.Space))    {
             if(target != null) {
                 AssignToActor();
             }
         }
     }
 
 
     void AssignToActor() {
 
         //parent object to actor just in case, and move it there (although the bone movement technically takes care of it)
         transform.parent = target.transform;
         transform.localPosition = Vector3.zero;
 
         SkinnedMeshRenderer targetRenderer = target.GetComponent<SkinnedMeshRenderer>();
         Dictionary<string, Transform> boneMap = new Dictionary<string, Transform>();
         foreach(Transform bone in targetRenderer.bones) {
             boneMap[bone.name] = bone;
         }
         
         SkinnedMeshRenderer thisRenderer = GetComponent<SkinnedMeshRenderer>();
 
         boneArray = thisRenderer.bones;
 
         for(int i = 0; i < boneArray.Length; i++) {
 
             string boneName = boneArray[i].name;
 
             if(boneMap.TryGetValue(boneName, out boneArray[i]) == false) {
                 Debug.LogError("failed to get bone: " + boneName);
                 Debug.LogError(i);
 
                 //Debug.Break();
             }
         }
         thisRenderer.bones = boneArray; //take effect
       }
 
         
 }