Towel Draping
I use a fitted and flat sheet in my practice, but my school taught everything with a giant bath towel as the main drape and a flat sheet under.
I had a full sized flat sheet that I put on the the table, the client laid on top of the flat sheet and the towel was on top of them lengthwise. Before starting the session, we'd pull the sides of the flat sheet up over the client and towel creating a sort of "burrito". To work the back in prone you simply let the top portion of the flat sheet hang off the sides (it was heavy enough to stay in place over the legs) and fold the towel down. To work the posterior legs I believe we would let one side of the sheet hang off on the side you were working, and took both the towel and the sheet over the opposite leg and tucked them under that opposite leg. I know this worked very well but I can't for the life of me recall what kept the sheet and the towel covering the glutes on the side you were working from separating
too much and exposing more than intended :?: Maybe it was just that the sheet and towel had enough combined weight and friction to remain in place as well as they did on the legs while working the back...?
Either way, you'd do the same for the legs in supine, and to work the arms you simply let the sheet on that side hang and pull the arm out from under the towel. I loved the fact that I could easily pull the sheet up over the arm or even the upper trap area to remove excess oil, in case the client was too cold, or just while I was doing compressions.
It was also very convenient when it came time to flip them. Let the sheet on the side your are on hang off, pull the opposite side of the sheet up and over the client as far as possible, shimmy the towel toward you and pin it against the table with your thighs, then lift the opposite edge of the towel and sheet together to create a secure tent for the client to turn over in. You are standing on the side so you don't see anything, your legs are pinning one side while your hands hold the other edges together. Worked like a charm every time! It also made diapering pretty easy.
I hope this helps some