My favorite buttonhole is a simple twisted yarn over. But when I need a bigger one, a one-row buttonhole is my preferred technique. Below is an excerpt from my pattern Minimissimi Sweater Coat.       Step 1: Work to the buttonhole position, slip 1 stitch knitwise, bring the yarn to the front and drop it (upper left). *Slip 1 stitch knitwise (upper middle), pass the previously slipped stitch over the just slipped stitch. One stitch bound off. Repeat from * to bind off the required number of buttonhole stitches (upper right). Step 2: Return the last stitch to the left needle. Turn work. Bring yarn forward. *Insert the right needle…