DD, then 5, did this on our first trip in a sparkly gown made by grandmother. She gots TONS of attention. Many other girls were dressed up, the oldest looked to be about 10. She wanted out of the dress after breakfast, though, so we carted it around the rest of the morning (in a bag) until we headed back to the WL a couple of hours later. If we were going to be there longer, I'd have gotten a locker.
The second trip, she didn't want to go to the trouble. She wore a princess tee and didn't get quite the lavished attention, but she was also two years older and didn't mind it.