Who are their favorite princesses? Outside of just sundresses and Disney bounding, Etsy has some really cute short sleeved cotton versions, or sometimes soft satin dresses, of the actual character dress- I know I've seen Cinderella, Anna, Elsa and Alice in Wonderland. I'm sure there are others. There is also a website called littledressupshop that has softer versions of the princess dresses. They are cooler because they don't have all the tulle, are not itchy, but still have the full princess style. That said, I don't know how Princess crazy your granddaughters are, but at age 5 and under, my DD would not care how hot it was- she wanted full traditional Princess dress on and would wear it all day at WDW.