Serger

If using a serger instead of a sewing machine, remember to eliminate or otherwise take into account the seam allowances given to each pattern, or you may end up with a larger pillow than expected.[…]Sergers, which create a series of overlapping stitches on the actual edge of the fabric, cutting away the excess, do not require seam allowances.

If you have a serger, you can use it to finish fabric edges so they don't ravel, but the zigzag stitch on your regular machine works well, too.

With that, Mikhail sat down to place spools of thread on the serger, studying the directions and clearly dismissing her.