We went on our first trip to WDW last Fall. Dh wasn't sure about a lot of the cutesy stuff like character meet & greets and the like although he really warmed to the characters. With that in mind I figured a couple sets of matching Disney shirts was all the luck I should press. On the way home, on the flight, he turns to me and says "so, we're going to get ears next time, right?"
I've got a sequined Minnie ears headband with a sparkly red bow in the middle - I rock those ears! DS's favorite was his original Jack Sparrow Mickey ears hat from his first trip. DH has always just gone with a Disney ball cap, and he gets a new one every trip.