My feather pillows keep leaking feathers. I'm tired of feathers tickling my nose when I sleep. I want to make covers for them (not "cases" but sealed covers that stay on the pillow - and yes I'll still be using an additional pillow case). I'm not sure if if regular quilting cotton would be the best to keep the feathers inside, or should I choose something different? I want to stick to an organic fabric ... I don't like poly.