The next part of altering a suit is to change the stride. Here is a better picture of pinning the excess out of the seat. These pants must be old with the style of low crotches because I pinched a HUGE amount out. To measure, measure both sides of the pinch. For example if one side of the pinch is 1 1/2″, then the total amount is 3″. Take out the pin. Then turn the pants inside out. On the inside leg seam mark 6″ above the hem allowance on both legs. (If you look carefully you can see a white mark on the pants on the left.Unpick from one 6″ mark to the other. The pants will have a huge gaping hole on the inseam. When the inseam is unpicked, because of the way the pants were made, the two crotch seams will be partly unpicked. To fix this, sew each seam back together to the edge. Now, remember the total amount from before? Mark that on the back pants piece from the original seam.Pin the front and back piece together, right sides together. Line up the new mark with the original seam line of the front piece. Once that is pinned, stretch the two pieces to fit.
Pin the two pieces.Sew along the original seamline of the front piece.
Once sewn, mark enough to trim off. I left about and 1 1/2″ seam allowance in just in case I need to let it out.
I zigzagged the edge to finish it.
Iron the seam open. You’re finished!