The single bunks in our "new to us" coach are narrower and shorter (72") than what most bunks seem to be now. I finally found sheet sets made of off stretchy jersey material, like what a t-shirt might be made out of, that while sized for a normal home sized single bed, fit well because they are made from that stretchy material. I found one set at Big Lots for about $8, and got the other on sale at Target for around $15...either way, much cheaper than the fitted sheet sets available at the rv dealers. I was also recently at a physical therapy session, and noticed the fitted sheets on the massage tables look like about the same width as the bunks. Those sheets are also somewhat stretchy, but come in various colors and materials. I They start at about $13 at places like massagewarehouse.com, and perhaps can be found in local stores as well.