I'm knitting a scarf and would like to put a vertical opening into it so I could slip the other side of the scarf through to hold it on and stay up close to my neck. How could I make an opening about 8 rows long and 2 stitches wide?
Knit until the row that you want the button hole to start. Knit half of the stitches in the row. On the next stitch, attach a second ball of yarn (or use the other end if you are using a center-pull ball). Knit the second half of the row with this second ball of yarn. When you get to the end, just turn your work around and knit with that second ball, when you get to the middle, pick up the working yarn from the first ball (it is still attached) and knit those stitches. Keep working this way until the button hole is long enough. Don't be tempted to make it to long, or it might slip out while it is being worn.