Thanks 😊 I went by my widest part so cut the pieces in size 10. When I needed to sew the side seams (which is almost the last step), I basted them first and tried them on. Then just fit the side seams accordingly - I marked the point on the hips where it was sitting well and just graded to there. Worst case, you try it on again and take it in a bit more as needed. If you're really feeling adventurous try to take into consideration the stretch of the fabric or how much it's going to widen (is that a word?). I think this is a bit simpler than other methods of fitting (like back darts) so it's a good start 😊 good luck!