Have a wonderful cruise! I know you're thoroughly enjoy it.
And definitely don't worry about the suit. On a regular basis I'll just take a blazer and Dockers. I'll wear the tie on formal nights and if I find the dining room a little chilly, then I'll wear it without a tie on other nights. You'll be fine!
And let us know all about it when you get back.
Travel Agent/Cruise Specialist w/12 yrs exp and 47 Cruises on 11 cruise lines! Favorites: Paul Gauguin - Tahiti: Uniworld River Cruises - Europe; Celebrity Solstice-class ships; Holland America - 12-nights Baltics & Russia; RCCL - 14-nights Greek Isles, Turkey, & Croatia; Holland America - 14-day Alaskan cruisetour; 10-night Canada/New England cruise; 21 days Hawaii w/7-night NCL cruise; Oceania - 25 days in Asia; more than 3 months touring Europe by train. And many all-inclusive resorts!