Shirt isn't a valid member of a model?

I have the error : Shirt isn't a valid member of an model.

wait(3)
Player = script.Parent.Parent.Parent
c = Player.Character
n = script.Parent
mouse = Player:GetMouse()

function hit(mouse)
	c["Shirt"].ShirtTemplate = "http://www.roblox.com/asset/?id=17527206"
	c.Pants.PantsTemplate = "http://www.roblox.com/asset/?id=165863810"
end

function onSelected(mouse)
	mouse.Button1Down:connect(function() hit(mouse) end)
end

n.Selected:connect(onSelected)

I tried this too

c.Shirt.ShirtTemplate = "http://www.roblox.com/asset/?id=17527206"

But it gave me the same error.Any help?

if not c:FindFirstChild("Shirt") then
	
end

Checks if the shirt is there or not