Might also consider cotton muslin sheets. They come in different thread counts - used to anyway
I strongly suggest soaking muslin in very hot water for at least a couple of hours and then washing and drying it.before cutting it.
I purchased RocLon muslin seve4al years ago- the end label said preshrunk - it shrank at least a couple of inches per yard. I measured it before and after. I was unpleasantly surprised.
Even the legacy muslin lfrokb jo-ann's shunk noticeably.