A Sewing tutorial showing you how to fix too tight pants by adding a tuxedo stripe coordinating material to use for the stripe (use bottom weight fabric like twill. Make a basic pair of drawstring or elastic waist pants with this complete photo tutorial. pieces of fabric that are 5 inches taller and two inches wider than your pants; A drawstring or strip of elastic Don't forget to add a couple inches at the top & bottom. A Step-by-Step Guide to Making Bell-Bottom Pants. I don't know about you, but unpicking a million stitches, adding a new waistband, etc. At the side seams I cut down to the bottom of the back yoke. However, if you are altering a pair of jeans you own, pop into your local fabric store and pick. If you'd like to add a little flair to your own jeans, all you need is a bit of fabric and a few minutes of stitching. You can use crazy patches or fabric.