1. lengthen shorten lines need to be perpendicular to the grainline. 2. make the same adjustment for front and back pattern pieces as well as any side panels. 3. keep your grainline lined up when you make the adjustment (the exception is if you’re only adjusting the back) 4. be aware you may need to lengthen or shorten your zipper, pocket and. In today’s video, we’ll show you how to adjust the rise (aka crotch length) of a pants pattern, including how to shorten, lengthen and lengthen only the back.
Use the grainline to aid in aligning the pattern pieces. tape everything down. redraw the center front seam and the side seam. cut your pattern piece out. there is no need to make any changes to the front pocket piece. once you’ve added the rise to the front leg, you need to repeat the same steps to the back leg. Tape or glue the pieces together. get a little piece of paper and stick it underneath the pattern piece at the side seam. redraw the side seams so they're smooth. make the same changes to any matching pieces, such as a back bodice. lengthening or shortening the rise on trousers (pants). To lengthen your pants, cut along the top adjustment line. then open the pattern up, adding half the length needed at the top adjustment line. ensure you add this evenly. repeat on the lower adjustment line. repeat on front & back, evenly. to shorten your pants, fold along the adjustment lines. fold out half the length needed at each adjustment. Place the piece of paper underneath your top pattern piece, lining up your top line with the cut edge of your top pattern piece. tape it in place. do the same thing with your bottom pattern piece. line up the cut edge of your pattern with the bottom line you’ve drawn on your paper and tape it in place. draw a new cut line along both side seams.
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