Sewing a simple skirt

This pattern is described as the simplest-ever skirt, in the book it appears in: Sewing Made Simple by Tessa Evelegh.
I wouldn't quite go that far; I've sewn some skirts that were simpler: one front piece, one back piece, sew the seams, hem in a piece of elastic at the top... However, it does look far more complicated than it is. It's a bias-cut drawstring-waist skirt. I love the waistband, which is a wide ribbon threaded through with narrower ribbon. In sewing this, I had a little mishap. I pinned the double layer of ribbon around the waist of the skirt, then I machined it... and found that it wasn't quite long enough, although it had been when pinned on. So my 'learning from experience' tip for this pattern is not to cut the end of the ribbon until you've sewn it on. Once you pull the ribbon drawstring though, the gap is closed between the two ends of the waistband piece of ribbon, so my error is not noticeable.