The shaped top row of the Bethany Skirt...
By changing the side stitches to hdt [htr] and ch1 in the 4 corners you will make a slightly narrower square adding a small amount of shape to certain places along the top row
I am going to use this slightly narrower granny square at the sides and in the same places as you would have darts in a skirt, 2 darts at the front and 2 darts at the back
DO NOT USE THE SMALLER STITCH ON BOTH SIDES OF ONE SQUARE
but on a left and right side of 2 squares creating a dart effect join as you go in the same way using a sl st instead of the ch1, at the corners and adding a sl st at the sides to join the squares together
The diagram above shows a skirt made from 7 squares wide and 6 rows, your skirt might be more squares so the smaller stitch might need to be on different squares.
Its not a huge amount but enough to just pull in the waist line a little to help with the narrowing of the waist line.
Pattern for the shaped Granny Square
ROUND 4, replace the side granny shells of 3 dc [3tr], with 3hdc [3htr], and only do ch1 in the corners keep the 3dc [3tr], the same at the top and bottom of the square, just do the smaller st, on one side or another and match 2 reduced st sides together when joining.