What to wear as Hannibal Lecter: Find an orange prison jumpsuit and pair it with that infamous mask and, if you want, a straitjacket. If you really want to go all the way, you can absolutely have someone strap you to a dolly.
How to act as Hannibal Lecter: Dr. Lecter is a calm, calculating mastermind and a veritable genius. You might want to imitate the way he says, "Clarice".