We get ours from regular stores like Walmart and Kohls. We use plain old Hanes or whatever brand they have. Keds have a fairly tight elastic in the ankle, but Hanes fits pretty loosely.
Ichthyosis-en-Confetti Type 2
Husband, Nathan - 10, Elliot - 7, Oliver - 4, all affected.
I also have an unaffected daughter, age 8.
email: jennifer at confettiskin dot com
facebook - find me on "ichthyosis mommy spot" or "friends of ichthyosis"