@realale that's my problem as well. I don't remember how to attach it, and the scooter skirt pattern I had is gone.
I think you have to treat the skirt and short as one, either over locking or stitching, then add the waistband as usual. Part of why I am looking for a pattern, too. None of my pattern books or sewing books deal with this particular style and I'm in the US where I can pay a couple bucks for the directions, even if they aren't what I am exactly looking for (knit vs woven). Old 60s styles, if memory serves, had the side or back zip closure and the shorts and skirt sort of sandwiched between to cover it, and the shorts were woven, but that has been years since I made it.
LOL, I am treating this like I don't have 8 pairs in the house...I wear them, my daughter wears them...I have several brands, too. I just don't like the way any of them actually fit (woven pull on is to be blamed here I am sure) and I don't want to have to do the RTW copy of them, or really draft them because I am being somewhat lazy.