Small adjustments to the fit of the waist of the skirt can be made by moving the buttons and press studs (snaps) on the side front of the skirt.
Additional adjustment can be made by unpicking the waistband along the contrast stitching (white), opening the waistband and letting out or taking in the centre back seam.
A tutorial on how to do this is coming soon!
In the meantime, there are some helpful YouTube videos here.