Mettler Silk-Finish Mercerised Cotton is my personal favourite, and best recommendation for top-stitching, and for appliqueing. I discovered this beautiful thread when I needed something a little thicker than ordinary cotton thread, but not as thick as Mettler’s Machine Quilting Cotton for applique work on quilts. For this technique, I use Gutterman cotton thread (more economical) in the bobbin, and the Silk Finish as the top thread. Sometimes do this for top-stitching too, but where top-stitching is going to show on both sides, like cuff, or hem, I use the Silk Finish in the bobbin as well. It comes in a range of gorgeous colours, and gives a gorgeous finish. I also use it for hemming quilts for same reasons. Unfortunately, it’s only sold in the small size spools but it’s not too expensive, and worth it.