Use a favorite "mild" detergent, and when you're ready to dry the comforter/bedspread, throw in either a clean tennis shoe or a couple of tennis balls. They will fluff the comforter or bedspread ...
You have picked out your bedroom and have purchased a bed. The walls have been painted and the carpeting installed. All the furniture is in its place. Now, you need to choose a bedspread.
The total size is 71" x 89". If you wish to create a backing, use this measurement. Cut the selected back fabric to size, and then place it against the bedspread "wrong" sides together.