You have to understand that you were sailing on NCL - their motto is, "You're free to.... whatever." So you'll find everyone is alot more casual in their attire for everything.
They don't have any 'formal' nights like most of the mass market cruise lines do. If you like formal nights, then you really need to try some other cruise lines. Depending on your age and lifestyle, you might prefer a little more upscale cruise line. My personal favorite is Celebrity as it's alot nicer with MUCH better food, and is definitely more upscale without being 'stuffy'.
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!