Help putting a custom mesh inside an accessory to put on the player?

local accessory = Instance.new("Accessory", player.Character)
v:Clone().Parent = accessory
accessory.Handle.FormFactor = "Custom"
accessory.Handle.Size = Vector3.new(0.2, 0.2, 0.2)

This script puts the item on the player, but it just immediately falls through the player and through the floor, before being destroyed. I just want it to be placed on the players head, like a normal hat.