bad argument #3 to 'Value' (string expected, got Object), how to fix?

On line 13, it fails. I've tried to make the 'Shirt' class an ObjectValue, currently a StringValue, but it would give another error saying that line 15: bad argument #2 to '?' (string expected, got Object). How can I fix this?

local player = script.Parent.Parent.Parent.Parent.Parent.Parent
local Shirt = player:WaitForChild("Shirt")
local shirtFolder = game:GetService("ReplicatedStorage"):WaitForChild("Shirts")

local shirts = {}
local Count = 1

local LB = script.Parent:WaitForChild("Left")
local RB = script.Parent:WaitForChild("Right")

function Update()
	script.Parent.Parent.Parent:WaitForChild("TitleShirt").Text = shirts[Count].Name
	Shirt.Value = shirts[Count]
	
	local clone = game.ReplicatedStorage.Shirts[Shirt.Value]:Clone()
	player.Character.Shirt:Remove()
	clone.Parent = player.Character
end

for i,v in pairs(shirtFolder:GetChildren()) do
	table.insert(shirts,v)
end

LB.MouseButton1Click:connect(function()
	if Count > 1 then
		Count = Count - 1
		Update()
	end
end)

RB.MouseButton1Click:connect(function()
	if Count >= #shirts then
	else
		Count = Count + 1
		Update()
	end
end)