I read on the Internet about a trick to hold your fitted sheet in place. Buy two pairs of suspenders, not the kind that is sewed in the middle, but the ones with a metal clip that you can cut off. Slide the fasterner to make the suspender longer; hook one end to the top of your fitted sheet; the other end to the bottom' do this twice. You will need one whole set of suspenders for this. Then hook a clasp to the one side and pull it over to hook the other side. We tried this, and it works. Because we had an extra suspender, we put two on the sides.