Waterbed sheets are expensive, if they even make them anymore. Who knows?
Many, many years ago, before I was married, I saw a demo on making waterbed sheets. I didn't have a waterbed at the time but a couple of my siblings did, and since I am the designated sewer in the family, I took notes.
You can make a set of queen sized waterbed sheets from two double size flat sheets.
You used to have to trim a double sheet to make a sheet to fit a queen-sized waterbed. Now, in the age of downsizing, there is no trimming necessary. (I pre-wash everything first.)
The nice thing about making your own waterbed sheets is that you can customize them to your own particular
So, all I do to make a bottom sheet for a waterbed is cut two 24” squares of fabric (Old sheets or pillowcases or muslin or any fabric will work. The pockets do not show so they can be made out of anything.) diagonally across so I have four big triangles. I hem the long edge with a 5/8 inch rolled hem and zigzag the other two edges. Then I pin a pocket right sides together to each corner of the full sized flat sheet and round the corners. A Tuperware Fix ‘n Mix bowl is the perfect size curve for this. Then just sew the pockets on with a 5/8 inch seam allowance and zigzag any raw edges (like the curve you cut.) Turn the pockets and you are done! If you want to attach the top sheet, do it now.
I can usually get great sheets on clearance. Even buying a full-sized set of sheets on clearance is cost effective even if I don’t use the whole set. It just depends on your preferences. I hesitate to give too much information. *snort*
So there it is. My waterbed sheet tutorial. Sorry there are no pictures. I have camera issues.