Consider your waistline to that to the circumference of a circle. So then, being that C = 2πr , the unknown dimension is the radius; thus solving for this unknown, the radius is then r = C/2π where the circumference, C, is your waist measurement. And as for the skirt length, L, is then equivalent to L = ℓ+r where ℓ is your desired length from the base of your waist which, in this case, is the calculated radius, r.
and again (horizontally) such that there are four layers of fabric
3) Starting at the corner fold, used a tape measure as a compass and
mark the radius and length with fabric chalk or washable marker.
5) Unfold into a half circle and cut a folded edge to accommodate a zipper enclosure.
8) For demonstration, I have featured a McCall's yoke pattern.
*To create your own pattern, follow along the curvature such that the
top arch measures 1/4th the length of your waistline. The center fold
will be a straight edge, while the opposing end will be at a 45° angle;
extend to your desired thickness and then utilize a french curve to
complete the bottom arc. Follow a similar approach for a back yoke.
Augment both patterns a quarter to half inch for seam allowance.*
Place the front yoke on the centerfold, trace and cut two out. Then
for the back yoke, cut two patterns and cut the fold such that there
will be a total of four back yoke pieces. (Repeat with interfacing.)
9) Pin a back yoke to each end of a front yoke, right sides together, and
sew with a straight stitch. (Add interfacing.) Repeat for a second yoke
set. Then place both yokes, right face together, pin and sew the along
the top edge with a straight stitch and finish with a zig-zag stitch.
sew in place with a straight straight and, again, finish with zig-zag.
*The wider the yoke, the lower that the skirt falls on your midsection.*
In my case, due to the width of this waistband, the skirt now falls right
above my high hip; so I remeasured and cut a wider radius to fit.
12) Fold over the waistband and pin down the raw edge tucked
underneath, then topstitch in place with a straight stitch.
14) Add a hem with a basic straight stitch. However, I singed the raw
edge with a lighter because apparently my sewing needle was too
thick for this particular fabric, causing it to pull and shirr away.
15) Cut any loose threads and there you have it, complete! Lovely. ♡