Shirt won't change?

I've re-worded this script in a million different ways but I can't figure out what's wrong. I have a SHirt on while testing this in a server.

game.Players.PlayerAdded:connect(function(player)
	player:WaitForDataReady()
	player.Character:FindFirstChild("Shirt")
		if found then found.ShirtTemplate = ("http://www.roblox.com/asset/?id=137904320")
	end
	end)

I'm completely stuck on what to do. This part of the script gives no output.

You don't have anything in the script that suggests 'found' is a thing. Try this:

local found = player.Character:FindFirstChild("Shirt")

Hmm, try this;

if game:FindService("Players")then
print("Script Loaded")
game.Players.PlayerAdded:connect(function(plr)
plr.CharacterAdded:connect(function(char)
wait(2)
for i,v in pairs(char:GetChildren())do
if v:IsA("Shirt")then
v.ShirtTemplate="http://www.roblox.com/asset/?id=137904319"
end
end
end)
end)
end

Hope this helped!