Thanks for the replies everyone! I was confused by the description on carnivals website - it made it sound like even the casual dining (buffet) required nicer clothes. It'll be a tug of war to get hubby to wear anything other than shorts but I have a nice dress and a nice black skirt with some nice tops - I'll pack him some pants and a nice button down shirt. We won't be doing formal nights but I definitely want to do at least one night in the dining room - I honestly can't remember the last time we went out to eat, never mind wearing something other than jeans. I'm thankful grandma and grandpa are going so we can get our 'night out' without the peanut (our daughter).
Thanks again for the help!