I copied this from Ngaire's great site:

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What about the Captains welcome aboard party is that also "Country Club Casual"? On the Paul Gauguin Tahiti cruises, the Alaskan and Bermuda cruises the dress code is Country Club Casual. This dress code is described below. Often the cruise booklet may suggest "you may wish to bring a jacket for the Captain's welcome aboard party". This is purely up to you. A tie would not be necessary, you will see some men in jackets or blazers. However you will also see people in the "Country Club Casual attire.