Click for clothes gui not working?

I've been trying to get this gui to work for it to be able to change someone pants and shirt when they click

Here's what ive been doing:

player=game.Players.LocalPlayer
button.MouseButton1Down:connect(function()
if player.Character:findFirstChild("Shirt") then
player.Character.Shirt.ShirtTemplate="http://www.roblox.com/asset/?id=147660556"
else
local s = Instance.new("Shirt", player.Character)
s.ShirtTemplate="http://www.roblox.com/asset/?id=147660556"
end
if player.Character:findFirstChild("Pants") then
player.Character.Pants.PantsTemplate="http://www.roblox.com/asset/?id=160568738"
else
local p = Instance.new("Pants", player.Character)
player.Character.Pants.PantsTemplate="http://www.roblox.com/asset/?id=160568738"
end