How do I add a beanie to this

Description: TrickeryDoll Name: Revie Alternative nicknames: Rev, Rere, Trix, Trickery (not preferred), and Trixster Age: Ask me Relationship status: Taken *Transgenner flag* Every sprite on this sheet is either made by a friend, made by me, or is here for reference, ask and I'll point out which Genesis sprite of my sona done by Nikki Asdo