How to put a hat on a player?

Firstly, Parent the hat to the player

game.ServerStorage.Hat:clone().Parent = player.Character

Then, use this equation to place the hat onto the right position of the body of the character.

hat.Handle.CFrame = char.Head.CFrame * CFrame.new(0, char.Head.Size.Y / 2, 0) * hat.AttachmentPoint:inverse()

So, In all, If I were to have variable named player that represented the character, the script would be this:

player = game.Players.LocalPlayer.Character
local hat = game.ServerStorage.Hat:clone().Parent = player
hat.Handle.CFrame = player.Head.CFrame * CFrame.new(0, player.Head.Size.Y / 2, 0) * hat.AttachmentPoint:inverse()