For a pencil skirt, you’re going to want a relatively strong fabric. It also helps if the fabric has some stretch to it. Stretch twill works well. A heavier non-stretch fabric would also work. You can even use a thicker t-shirt knit or spandex, especially if you don’t want to fuss with a zipper and darts.
The key to a great pencil skirt is fit. To get a good fit you need good measurements.
First, you need to decide if you want the skirt to go all the way up to your natural waist, or just to your low waist.
If you want the higher waist, use the four measurements shown. If you want it at your low waist, you don’t need to measure your natural waist.