Trying to change material of player with a button through an item shop. not sure how to need help can't find answer

The Script i have connected to the players i would like to change color of is this

 public Material skinMaterial;
 void Awake()
 {
     gameObject.GetComponent<MeshRenderer>().material = skinMaterial;
 }

alt text

this is the code i have for the button to change material of the player which is in all scenes

and for the i cant figure out how to make the skin material change on the inspector based on which button i press. i have the script on the buttons and on the main menu containing the buttons.