Wherever you want to add the slit, use your method of choice to finish the seam. (In the above photo, there’s a serger finish.) Keep in mind that the seam allowance needs to be left intac… See more

Grab a tape measure to determine where you want the slit to be on your body. Measure those dimensions on your fabric, making note of where the seam will finish and your sli… See more

Sew the seam per usual, but stop at the mark you made. If this seam has a zipper or any closures, treat them as you normally would before stopping at the mark. See more

Press the seam open. Continue pressing so that the unsewn part of the seam is done too. Be sure to maintain the same consistent seam allowance all the way down to th… See more