Our family treats cruises like prom. It's our favorite time to dress up and get pictures. The masculine ones wear tuxedos. The fem ones wear over the top gowns. Rhinestones for both genders! We definitely stand out but we don't mind.  Celebrity has less Tuxedos than Cunard, but more than Holland. All the cruiselines have gotten a little more casual but those of us who like it still dress to impress.