I tried to sew another sash today. I didn't get very far on it and I could tell that it was going to be lumpy, so I decided to leave it alone and do more research on sewing satin instead. According to someone on the about.com sewing forum, casa satin (the white fabric I was using) is of inferior quality. Considering that my cut pieces of said satin are literally falling apart just sitting in a storage bin, it doesn't feel quite as nice as the blue satin, one of my pieces got a couple of snags in it, and I can't seem to stop it from sliding around, I think they're right. The blue satin is of noticeably higher quality and, though it unravels (all satin does unless you finish the edges somehow), it isn't magically losing entire rows of thread without being handled at all. Going by its feel, sheen, and price tag, I'm pretty sure it's L'Amour, so unless anyone has any better ideas, I'm going to go ahead and just order a couple of yards of white L'Amour satin to use. I'll still want to stabilize the seams, but I think it should be easier to work with. I'm just glad that I didn't get very far on the project and that I have lots of time left to finish everything. Being able to cut your losses = teh r0x0r.