If you are talking about Ocean Village cruises, I don't believe there is a dress code onboard! It is for people who don't do cruises after all! So long as you are reasonably decent in the main eating areas I think that you can wear more or less what you like, when you like. Not for me I am afraid! Happy cruising.
This has been copied straight from the OV website under FAQ's.
What should I pack?
The beauty of Ocean Village is that there are no set formal or semi-formal dress codes on board. Casual wear is always fine - all we ask is that you cover-up when eating or drinking inside the cafes, bars and restaurants. The only place where you may want to dress up a bit on board is in The Bistro, where things are more smart casual and you may want to push the boat out for those special occasions.
Please note that if you are on a Stay and Cruise holiday you may be required to wear smart casual clothes/long trousers for dinner at some hotels.
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Ocean Village appeals strongly to mostly first-time-type passengers by "tearing up the cruising rule book" and targeting the "Dress Down Friday" generation. The go-getting "Dress Down" generation is in favor of casual dress, sporty activities, eating when you please, standup comics and rock concert-style entertainment. Casual is the order of the day on Ocean Village; none of its restaurants have dress codes (though most passengers dress respectably when coming indoors). There are no formal evenings, so these cruises are heaven for those who like to travel light.