This is the method I use for all buttonholes except the very tiny, where some form of eyelet is more appropriate. It looks great on garter stitch bands like the ones on wee Chickadee.
Congratulations to our Glenmore KAL prize winners! If you're still working on your Glenmore this blog series will stay up, so you can refer back to the tutorial for any section as you knit at your own pace. For inspiration and motivation check out all the lovely Glenmore projects here.