It may be a rule by the show (I assume you mean a judge of a show) that they require permission but that is not the law. I'd probably question it. The licenser (Disney, et al), licenses the manufacturer to use their designs to produce fabric. You, as the purchaser of that fabric, are under no contract as to what you can do with that fabric.
You could use Disney fabric to create bedding items and sell them. Here is an example of someone who used licensed fabric to create bedding and was sued.
http://www.tabberone.com/Trademarks/...tedMedia.shtml