The same quality of fabric should be used, but this is not always so. If the quilt is a wallhanging, than the usual 36 inch seamless back is an easy cut. The backing needs to be cut 4 inches larger on all sides and should be sewn on a verticle or a horizontal seam. There are several options to think of when choosing batting for your quilt projects. All the answers to the above questions will affect how your quilt project looks when it is complete.
Many battings come in standard and pre-cut sizes.
120 x 120 inches Batting comes in an array of fibers, yet not all these different fiber types come in standard sizes. If you are looking to have an old fashioned feel, perhaps a bit rumpled and well loved, then using a batting that is mostly cotton is a good choice. One thing to think about is that cotton batting requires more quilting than some other available fibers. If you do not want to do a lot of quilting, try using a low loft poly batting. Then again if you are still in question about your batting choice, than a helping professional at your local quilt store can help you further.