I use it for many things ~ mostly I use it to hand-baste quilts, then I don't have to pull the basting threads out. Major time saver! One of our LQS also has garments on display, and they were having a problem with theft of the display pieces... especially bathing suits! So they started sewing them with the water soluble thread... haa haa they caught the thief! It was one of their young girl employees! Boy was she embarrassed at the pool! :)
I make garments, too so use my quilting skills for unique jackets. I use the washaway all the time there, too to hold things down. Works great for a quick sloppy basting on applique, then you don't worry about getting stabbed with pins (or losing pins for someone else to step on) at a doc appt or whatever. And it is very strong, too, at least the little spools I buy in the quilting notions at Jo's