In this script, how could I make the uniform changing process automatic?

Hello, I've recently got into scripting, and have started dissecting free model scripts to try and learn as much as I can. I would like to know what part of this script is responsible for the player having to press a button to equip the uniform, and what parts I'd need to remove to make the player equip the uniform on spawn.

The group, pants and shirt IDs are all stored as IntValues, and the script works thus far:

print("Loaded Uniform Script.")

repeat wait() until game.Players.LocalPlayer
local Player = game.Players.LocalPlayer
local Character = Player.Character

--Settings
local ScreenGui = script.Parent
local UniformButton = ScreenGui:WaitForChild("UniformButton")

local Settings = script.Parent:WaitForChild("Settings")
local CertainTeam = Settings:WaitForChild("CertainTeam")
local CertainTeamColour = CertainTeam:WaitForChild("TeamColor")

local UniformRanks = Settings:WaitForChild("UniformRanks")
local GroupId = Settings:WaitForChild("GroupId")

local Ranks = {}

--Functions
function GetSettings()
    if CertainTeam.Value then
        if Player.TeamColor ~= CertainTeamColour.Value then
            ScreenGui:Destroy()
        end
    end 

    for i, v in pairs(UniformRanks:GetChildren()) do
        if v:IsA("NumberValue") or v:IsA("IntValue") then
            if string.find(v.Name, "Rank") then --Checks it's called "Rank"
                table.insert(Ranks, string.sub(v.Name, 1, 5))
            end
        end
    end 
end

GetSettings()
local HighestRank = 0

UniformButton.MouseButton1Down:connect(function()
    if Player:IsInGroup(GroupId.Value) then
        if table.getn(Ranks) ~= 0 then --Checks that the table isn't empty.
            for i, v in pairs(Ranks) do
                local PlayerRank = Player:GetRankInGroup(GroupId.Value)
                local Rank = UniformRanks:FindFirstChild(v)

                if PlayerRank >= Rank.Value then
                    if PlayerRank > HighestRank then
                        --Gets the highest ranked uniform a player can wear.
                        HighestRank = Rank.Value
                    end
                end
            end

            if HighestRank ~= 0 then
                local Uniform = {}
                for i, v in pairs(UniformRanks:GetChildren()) do
                    if v.Value == HighestRank then
                        Uniform.Shirt = "http://www.roblox.com/asset/?id=" ..v:FindFirstChild("ShirtId").Value
                        Uniform.Pants = "http://www.roblox.com/asset/?id=" ..v:FindFirstChild("PantsId").Value
                    end
                end

                --Removes Shirt/Pants if they are wearing any.
                for i, Object in next, Character:GetChildren() do
                    if Object:IsA("Shirt") or Object:IsA("Pants") then
                        Object:Destroy()
                    end
                end

                local Shirt = Instance.new("Shirt", Character)
                local Pants = Instance.new("Pants", Character)
                Shirt.ShirtTemplate = Uniform.Shirt
                Pants.PantsTemplate = Uniform.Pants
            --else
                --print(Player.Name, "tried to wear some uniform, but the ranks are too high for them!")
            end
        end
    end
end)