The hat ( like a hoody which is what my son wears ) is Way to stop the visual over stim, when you have trouble discriminating between certain shapes etc and get overloaded you can pull your hat gown over your head a retreat for a bit. And let's face it DL is a feast for the eyes , but that is not always a pleasant feeling for everyone. Something else you could try is just a piece of Lycra , your kids can wrap it around themselves as a "hug" which is what the central nervous system needs. If they don't like light touch , and are tactile defensive then make sure you are doing your deep pressure feedback starting at the shoulders and making your way down the arms, hips and legs. Allowing them time upside is very helpful also, my son watches TV upside down . Crazy critter that he is..

some kids get over stimmed by smells, if this is the case with your kids I would make sure they have a small piece if material with a familiar scent on it that they can use as a barrier against the Disney smell.. Hope you have a great trip.