Yes u can rent Tux's onboard ship.....for a seven nite cruise it's around $100.00( 2 formal nites)....U should rent in advance...especially if U r not a regular person....ex:.a very tall person...onbaord they pretty much stock just standard sizes..
Hope nobody takes offense to not a regular person comment
Yes, you can rent tuxedos on board the ship. My husband and I are going on the Conquest 3/21/2004 and he called carnival 1-800-522-7648 and reserved a tux and shoes. $75 for tux and $10 for shoes. I think that price is reasonable and it frees up space in our suitcases for other things.