Now, you should have a rectangle-ish shape to work with. Fold the sheet in half so that the elastic edges are hidden, smooth ...

fold the other pieces in the size of the pillow cover(a bit smaller, so they can fit in). It’s time to fold them all. To fold ...

Fold into thirds lengthwise, smoothing sheet as you go ... replacing flat sheet with main bath towel, and pillowcases with face and hand towels.