How would I morph a certain person that would join with a hat too?

K, I've played around with the script for a while but I couldn't do it. I was wondering how I would morph a CERTAIN PERSON WITH A CERTAIN USERNAME! Also how would I add a hat into that?

game.Workspace.ChildAdded:connect(function(plr)
local name = plr.Name
local playerinplayers = game.Players:FindFirstChild(plr.Name)
if playerinplayers ~= nil then
	playerinplayers.CanLoadCharacterAppearance = false
	plr.Head.face.Texture "rbxassetid://204309430"
	local bodycolors = Instance.new("BodyColors", plr)
	bodycolors.RightArmColor = BrickColor.new("Pastel brown")
	bodycolors.LeftArmColor = BrickColor.new("Pastel brown")
	bodycolors.RightLegColor = BrickColor.new("Pastel brown")
	bodycolors.LeftArmColor = BrickColor.new("Pastel brown")
	bodycolors.TorsoColor = BrickColor.new("Pastel brown")
	bodycolors.HeadColor = BrickColor.new("Pastel brown")
	local shirt = Instance.new('Shirt', plr) 
	shirt.ShirtTemplate = 'rbxassetid://183825508'
	local pants = Instance.new('Pants', plr) 
	pants.PantsTemplate = 'rbxassetid://183825508'?
end
end)