Sorry to ruin your fun. We've been on 8 RCCL cruises and i don't rent or own a Tux. I wear only suits; yes one of them is a light grey. I would say Grey suit and a tie is "suitable" for formal night. Our last cruise(8/14/03) we skipped formal night and ate in the Windjammer Cafe. Same food as in the main dining room, but in the cafe its buffet style.