Note: I just tried to post this message using the title “Mystery Fabric”, and my post got lost – apparently that title was used for another thread a couple of years ago, and my post was not added to that thread, but when I click on my topic, now listed in the Discussions list, it takes me to the old thread. So, be careful if you’re posting a new topic, not to use a title that’s been used before. I think this is the same problem that has occurred with some topics called “HELP.” Ah, well, on to the subject at hand. How I wish I had Claire Shaeffer’s book on fabrics. I bought several yards of a drapey knit fabric – a thin sweater knit with practically no recovery – which was marked “Various Fibers” – very helpful, huh? It feels like rayon to me. I washed and dried a 5″ square of it, and it shrank 1/8″ in both length and width, with no other change in tactile character, color, etc – not too bad, so I’ll go ahead and pre-treat the entire yardage. Still, I’d like to know what it is. Isn’t there some kind of burn test I can do? Btw, I plan to use my fabric on Simplicity 3790: http://www.simplicity.com/Search.aspx?SearchTerm=3790 Any advice on this pattern? I expect this very unstable fabric to be a bear to cut out.