I am in the early stages of planning for a down UQ, TQ, pillow and who knows what else.
I searched around and could not find the answers I was looking for.

Are there fabrics that should or should not be used for down filled items?

I know UQ should be able to breath. At least I thought I read that somewhere. Does that mean no more than one side with silnylon? Does this matter on pillows and TQ?

Suggestions are appreciated.
Thanks!