Welcome aboard, Christine! I'm so excited to hear that you'll be setting sail for a magical Mediterranean cruise with Disney this summer! When I was in Europe with Disney Cruise Line last summer I was so thrilled with every single aspect of the itineraries and Port Adventures available for guests. You're in for so much fun!
Men can absolutely wear a nice polo shirt with dressy khaki shorts or pants on Cruise Casual nights. In fact, that is what you'll see most men wearing. If you choose not to dress it up any more for Formal Night, you can certainly head up to Cabanas for a more laid back dining experience that night. Or, of course as you mentioned, room service is available 24-hours a day too. Alternately, there are some great quick service spots near the pool, so you're welcome to relax pool side and enjoy a casual dinner as well. Just check your Personal Navigator each day for the Cabanas hours and quick service dining spots so you can better plan your evenings.
If you haven't already, take a look at the
"A Moms Take" Mediterranean cruise videos that I did with Disney Cruise Line. I've got lots of extra tips for setting sail on this exciting itinerary that I share in those videos, Christine. Have fun as you continue to plan and please let me know if I can help answer any other questions before you head overseas, Christine!