How Do I Save Clothes With DataStore?

I've just recently learned how to data store values but I have no idea how to data store clothing. I have tried saving the players shirt but It doesn't seem like i'm doing in right.

local DataStore = game:GetService("DataStoreService")
local SaveData = DataStore:GetDataStore("CharSaves")


-- load savedata

game.Players.PlayerAdded:Connect(function(plr)
    plr.CharacterAdded:wait()

    local char = plr.Character
    local ShirtID = char:FindFirstChild("Shirt").ShirtTemplate

    local shirtdata 
    local success, failure = pcall (function()
        shirtdata = SaveData:GetAsync(plr.UserId.."Shirt",ShirtID)
    end)

    if success ~= nil then
        ShirtID = shirtdata
    else
        warn("Data Loading Error")
    end

end)

--Save on removing

game.Players.PlayerRemoving:Connect(function(plr)

    local char = plr.Character
    local ShirtID = char:FindFirstChild("Shirt").ShirtTemplate
    local success, failure = pcall (function()
        SaveData:SetAsync(plr.UserId.."Shirt",ShirtID)
    end)

    if success then 
        print("Shirt Saved Successfully")
    end
    if failure then 
        warn("Shirt Save Error")
    end
end)