I would suggest it would be a good idea. It may be a bit chilly otherwise.
It is advisable as the air conditioning can be quite chilly if your not wearing any clothe.
Yes, otherwise the soup stings when it drips in your lap. ...Nei.
Please please PLEASE let us know which cruiseship/line you have in mind!!!Without this basic info. none of us can help you and quite frankly I imagine a number of regular repliers are becoming a little irritated (as I am) at how many enquirers are leaving out this most basic fact when asking questions!We are a friendly bunch on here, I think, but go on, give us a chance to be of some help, or we may loose the will to live.
There are cruises for nudists even on these cruises you have to wear clothes for dinner if you state cruise line/ ship then a more detailed reply can be give.
Yes, I am not aware of any cruise lines that do nude dining!!
Seriously, almost all cruise ships have dress codes, and almost all have areas where you don't need to dress formally.