I agree with ck about the interfacing. I used to do a lot of garment sewing. Silk is beautiful, but the slippery kinds like china silk and charmeuse are very hard to work with and do fray like crazy. Also keep in mind that the silk may or may not wash well. If you are using it in a quilt this could be very important. I have mixed silk with cotton without any problems except the normal ones when dealing with two very different fabrics.