I agree about using cotton to stitch cotton onto cotton. I used whatever I had on my first quilt years ago and used Dacron batting. Some of the 100% cotton fabrics wore out, and the polyester thread cut through them. A few years ago, I took it apart and rebuilt it from what was left, adding new background and backing, and cotton batting, and some new blocks. I like Connecting Threads thread for hand appliqué. I use clip-on magnifiers to see the threads of the fabric and make my stitches as tiny as I can. If people can see the stitches, they'll know it wasn't fused. Having said that, I think everyone should use the methods they like best and the materials they prefer.
Hi, I'm new here. Love, love, love doing applique. My thread of choice is the DMC machine embroidery cotton. It comes in every color you can imagine. I often go to the neutrals if I don't have the right color. I heard wonderful things about silk--tried it. My experience was it sparkled when it should have been silent.
I am doing Hawaiian quilt blocks at the moment and I use Connecting Thread's cotton thread - which is 100% cotton, 50/3. (I also use it for quilting on my sewing machine.) I run it through bee's wax so as to keep it from fraying and twisting so much. When I started Hawaiian quilting years ago, I used Coats & Clark polyster-wrapped cotton, and it was fine, 35 years later, the wall hanging I made is still looking new. When I took a needle-turn applique class the instructor told us to not use embroidery thread (oops, this was after I made 32 blocks of appliqued butterfly for a child's quilt), although I didn't catch her reason why not to. So that was almost 15 years ago, the quilt is now faded from washing and being used as a tent and picnic blanket, but the appliques have not torn apart nor did the thread cut into the background fabric.
I do agree that the choice is ours to make which thread to use.