sorry, not use to talking with other quilters and I'm using my 'layperson, doesn't have a clue' vocabulary...The saris in question are made of silk...I have never PIECED with silk before...as with most things you can find a yes & a no to every question on the internet lol several bloggers said that silk will fray and fall apart much easier than other fabrics and it has to be whip stitched immediately after cutting.