I am certain that someone here can answer this simple math question, but I don't have a clue. I want to make a twin size D4P for a friend and cannot find out how much fabric I need for it. I would like to make it out of 2 background fabrics and 2 oriental prints. All I can find online is how to make the patch out of charm packs, but I don't want to use a charm pack. Help, please!