hopetoquilt

What qualities in a fabric do you look for when you do reverse appliqué. I tried using kona white fabric and i am having alot of difficulty. Even though it was washed, the fabric still felt a bit "stiff" and was difficult if not impossible to get rounded pieces to come out correctly. It looked very angular. I want to start a quilt from the Dutch treat book and I want to buy appropriate fabric. Are any brands better than others for reverse appliqué?

second question... How much fabric do you leave to turn? 1/4 or 1/8 inch? What is easier? Does it matter?

Thanks in advance for your assistance.