There is another knitting site called Knitting Paradise.com. On that site I discoverd a vey clever lady named Lena B. She adapted the grandmothers dish cloth to make wraps. They are wonderful since no triangle down the back for the wheelchair bound residents. And boy does she knit a lot! Tons for dialysis center, and nursing homes...and I am certain more than I know.
She generously agreed that I could share this info with you all. I will post pix of one so you can see it unfolded and then folded easily into a wrap.
Some she does just garter stitch, others with any pattern, stripes, colours galore. But the base always the same.
She will cast on 40 or 60 sts. Then increase by one every row to 160.