Calgon's Ultimate Packing List for Warm and Cool climates is just what you are looking for. It is a Hoot! Try alwaystraveling.com and look for reference to Calgon. If that doesn't work, log onto Cruise2.com as he is a frequent contributor. Even though I don't pack everything he recommends, it helps you not to forget important things. e-mail me after New Year's if you can't find it. I am on vacaton at home this week and my records are at the office.
Happy New Year.
On most of the E Carib cruises wear a pair of shorts, take a clean shirt for each evening, wear shoes that don't require socks and you will look like everyone else. Underwear is optional. I would think ship's would require luggage like the airlines but the last three day junket I was on I'll swear there were people who lived on the pool deck and left wearing the same clothes, (not much) they got on with.
If you insist on more, check the cruisediva site. She packs everything she owns and then some.