On the shorter cruises fewer dress up in full costumes but on the longer cruises people seem to go all out and many wear full costumes.
I have worn mine when we had a lot and just a few. I got many compliments from people and many asked, How did you know to dress up?
Many people dont know about the fact you can dress up, mostly on the Wonder cruises.
But I say dress up, be a kid again, it is fun and others will be wishing they had done it too!!
I have heard several times people commenting that next time they were going to dress up too. it really adds to the fun of the evening.
GO FOR IT !!! HAVE FUN!!!!