Hmmm, good question valtime. My grown son has a pair but it's the kind where you can zip off the lower part to make them into capris. I think he might have gotten them at The Gap or Old Navy, but that was sometime ago.
RCCL, 1992, 3 days, Empress of the Seas
CCL, 1997, 7 days, Celebration
CCL, 2007, 7 days, Legend (first family cruise)