Buttonhole

Explanation

A buttonhole is usually made by binding off a small number of stitches at the correct spot in the row, then casting on the same number of new stitches over the gap in the same row or the next, creating a small hole sized to fit the button. The exact method varies depending on whether you want a horizontal or vertical buttonhole, and cardigan patterns often specify the exact placement and spacing between buttonholes based on button size. The edge around a buttonhole is often lightly reinforced to withstand repeated wear.