How many threads do you use for blanket stitch?
Poke the needle through the top of the first stitch you made and knot it at the back. This should result in two threads along the same line and complete your blanket stitch. If you are sewing two layers along the edge then do not poke your needle through at the top of the first stitch.
What thread is best for blanket stitch?
Blanket stitching can be done with yarn, 6 strand embroidery floss, pearl cotton, and many other threads. Basically, the thicker and heavier the fabric you are using, the thicker the thread and the larger the needle you will be using to blanket stitch. Makes sense, right?