I googled dupioni silk and there's a lot of info on pre-washing etc because of shrinkage. Jenny Haskins of Creative Expressions magazine uses dupioni for all quilts. I've recently begun Cabochon Treasures by Kenny Kreations which is heavy embroidery but, half-way through the project and haven't decided which method of iron on stabilizer to use because there is a little puckering of fabric which is acceptable because of quilting later. So far I'm using normal size 11 needles with Royal rayon threads.