Change Clothes When TextButton IsClicked?

so player clicks the buttons and changes his clothes But this Local script is not working. Local Script Is Not Mine. But i tried to fix still dont works so i came here to ask for help.

shirtid = "http://www.roblox.com/asset/?id=478566599"
pantsid = "http://www.roblox.com/asset/?id=54361253"
button = script.Parent

button.MouseButton1Click:Connect(function()
    player = game.Players.LocalPlayer
        char = player.Character
        if char:findFirstChild("Shirt") then
            char.Shirt.ShirtTemplate = shirtid
        else
            a = Instance.new("Shirt", char)
            a.Name = "Shirt"
            a.ShirtTemplate = shirtid
        end
        if char:findFirstChild("Pants") then
            char.Pants.PantsTemplate = pantsid
        else
            b = Instance.new("Pants", char)
            b.Name = "Pants"
            b.PantsTemplate = pantsid
        end
end)