We did the DRAGON itinerary in 2005 with just a carryon bag. :D
All luggage for the four of us lost en route so we had three days in Hong Kong and seven days onboard before luggage caught up in Saigon. Ship's tailor fitted my father and I for tuxes and long skirts for Arlene and my mother.
I like CCC and informal but don't mind taking the tux. I have three cumberbund/tie sets so I usually bring all three for variety. We have never had problems with weight.
