Hi 94sunshine, welcome to CruiseReviews! I'm with LisaP, I enjoy dressing up for dinner and I've never been the only one. We sailed on the Epic last year and the Sky this year. I dressed every evening and found not too many people that were not dressed nicely. I really enjoy dressing for dinner because where we live a new pair of jeans or tennis shoes is considered dressing up
I hope you enjoy your NCL cruise, I've always had a wonderful time. If you're sailing on the Epic, she's a really incredible ship!