Although my wife & I have been on many cruises, the last three were on the Windsurf. We have been spoiled with their casual attire. With that in mind, and knowing that I will not be packing a tuxedo, how many nights should I expect to wear a tie on a 7 night cruise?
It all depends on how YOU feel about it. I wore a tie only on the Capt's night, and that with a sport coat and slacks, and never came near a tie again, and that on an 17 night trip. They're not going to say anything (too good manners to do that): the only criterion is if being less formal bothers you. The ladies like to dress, but I don't, and won't. And Radisson is happy with my business.
Where is your sailing? If Voyager to Med, I believe only one formal night. Caribbean plan on two. Rest split between informal and casual. I wore a tie on about half of informal nights. I also wore a sports coat on many of the casual nights.