How to fix "Cannot instantiate objects with constant parent"?

Question

Unity

Good day, gentlemen and ladies.
There was a problem creating the object.

The following script hangs on the character, which stores empty objects in itself:

Script

Accordingly, there is a store that stores ScriptlObjects with all the models I need.

Score

The main problem is that if, when creating an object in the Player Clothes script, as transform, select the first cell to create (that is, Element 0 - GameObject), then it will create absolutely any object without any interference.
If you try to create on any other transform, then the following error pops up:

Mistake

The method itself:

Method

public void WearClothes(StoreSlots storeSlots)
    {
        if (storeSlots.StoreEntity != null)
        {
            index = storeSlots.slotID;
            if (storeSlots.accsesType == StoreSlots.Accses.Opened)
            {
                Instantiate(storeSlots.slotModel,_clothes[index].transform);
            }
        }
}

When trying to set code like this:

The code

public void WearClothes(StoreSlots storeSlots)
    {
        if (storeSlots.StoreEntity != null)
        {
            index = storeSlots.slotID;
            if (storeSlots.accsesType == StoreSlots.Accses.Opened)
            {
                GameObject cloth;
                cloth = Instantiate(storeSlots.slotModel);
                cloth.transform.parent = _clothes[index].transform;
            }
        }
}

The following error comes up:

spoiler

Help me please.