Personally, I wish they'd do away with "informal". It's that middle category of dressing for dinner, requiring dressy clothes that aren't quite formal, but you really can't where at any other time. I don't mind bringing the couple of formal gowns or dresses for formal night, in fact I'm one of those who love formal night. But having to cart a few dress-up outfits as well is just a hassle. The great thing about Country Club Casual is that you can wear your nicer casual clothes, ones that you can also wear at other times, such as for shore excursions or afternoon gatherings or whatever. Whereas for informal night, most women seemed to be in very nice cocktail-length dresses, which aren't really appropriate for much else! Just more baggage.