Question About Formal Evenings On The Disney Cruise Line

This Will be my second cruise is The Disney Cruise Line. I Was wondering about how and Where Do I rent a tuxedo for formal The night? How Much does it cost to rent it for however long the Day or you must hold it for The Duration Of The cruise. I Am Going With My Friend And His parents, so I'm Not Exactly responsible for myself. So do i need to get it Before We depart? Any Help Is Appreciated.