How to make this script LocalPlayer?

I am trying to do this:

I want this script to ONLY run if you are wearing the hat, but the SCRIPT only runs for you WHEN YOU are WEARING the hat.

function nvg(p)
    p.CharacterAdded:connect(function(c)
        Instance.new('SelectionBox',p.Character).Adornee=c
    end)
end

for _,p in next, game.Players:GetPlayers() do
    Instance.new('SelectionBox',p.Character).Adornee=c
    nvg(p)
end
game.Players.PlayerAdded:connect(function(p)   
    nvg(p)
end)