how does one save a character's hat?

So I've spent 4 days just trying to wrap my head around data saving a characters appearence in Roblox, but I haven't gotten much help. I finally completed my character customizer UI, but i don't want player to re customize their character everytime they join. *note that the hats are not from Roblox , I made the accessories my self. I resorted to saving hats because i just feel like im not capable of saving other things. This is what I have so far.

local dss = game:GetService("DataStoreService")
local myDataStore = dss:GetDataStore("Outfit")
local ReplicatedStorage = game:GetService("ReplicatedStorage")

its not very much, but I don't really know what to do from now on. Help is Appreciated.