Hi Heather. I think Dorothy has the best ideas. The suggested dress code on Carnival ships applies to children, as well as adults. I love seeing the little ones in khakis and nice shirt in the dining room - for all casual evenings. To me, it teaches them to follow mom & dad's protocol for dressing for an occasion. Besides, they look so darn cute when properly dressed. Me - I would leave all jeans at home. You sound as if you want to do what is correct, and jeans are simply not appropriate for a formal setting dining room - whether it's formal night or not. Have a great cruise!