The basic element of the waistband was a nice Indian style tape, which had no stretch, but there were also 2 types of belt loop and skirt lining so I would have to add an insert to make the waist bigger, merely cutting a strip from the top wouldn't do it.
I removed the tape and added it to my stash.
I opened the centre back seam and added 2 inches to the waist with a triangular panel, also adding a new waistband from some stretchy fabric I already had.
This skirt is now a perfect and comfy fit, more details here
I've worn it a lot, at home and on holiday, because I like the style and colours.