Double knit buttonholes via grafting create beautiful buttonholes in double-thick fabric

Here is a beautiful grafted buttonhole for double thick fabric, such as a folded-over button-band. These are GORGEOUS buttonholes: blue-ribbon, state-fair stuff. But! They are very stretchy because grafting does not constrain the buttonhole in any way: structurally, grafting IS knitting. Rough handling will stretch these out. (For a good-looking buttonhole that can take a beating, use my&