Don't use a sheet that is says sateen - does not matter of the thread count if it has sateen...it will Pill!!! Use 100 percent cotton. I find I have to really read the package becuase many have sateen hidden on it somewhere. I have not used a sheet yet for backing but may use a flannel sheet in the future. I find I replace sheets once a year on the bed so a bit nervous that they will not last as long on the quilt. I do not buy cheap sheets and they still do not last. Flannel sheets may be good for a baby blanket since they quicky out grow them.