Concerning bed sheets. 42 years ago I made my wedding dress from a new sheet, turned out great, very hard to sew on; then 10 years ago cut it up for fabric. Problem is I bought the best sheet I could find, shrunk it first, but the sheet was like sewing through a very heavy batik, if that makes since. I still use flat sheets, but make sure they are 100% cotton, much easier to use.
Hope this helps.
http://cluttergutter.com.
Kelly