The 3 pattern pieces are traced onto paper, without the seam allowances, and lined on the table grid, seamlines matched.
I expected to need increases in the waist, then checking hips, with considerable shortening. I measured the high waist (top of the pattern) since the natural waist is 3″ lower. You can see the inch marks on the pieces. I couldn’t believe I got it right. 😉 My skirt front piece was a little off at the top edge. I matched them up at the pleat marks on the sides.
The high waist for this “25 inch waist” skirt measured 29.5″, without seam allowances, folded pieces doubled, R&L side panel doubled. the “natural waist”, 3″ down from the top edges, measured 33 3/4″. We’re definitely talking fitting muslin!
I measured the “high hip”, 3″ down from the natural waist, 40″. The “full hip”, about 9″ down for me, measured 45″. Depending on drape, I may not need to alter these.
The length will definitely need a bit out in the thigh and shin, maybe a bit narrower at the hem to try to keep the proportion. And I still need to add a hem allowance when I do the seam allowances. It is a pretty curvy hemline, lower in back, so not too deep a hem. Maybe even faced…horsehair???
I hope you can see the red dashes I made for the natural waist, high & full hips.
Next, tracing a copy with alterations, then muslin…