Whether you want to give a little fluff to a skirt, or you want a full poof, adding tulle is easiest way to accomplish the task. Tulle, an inexpensive fabric that resembles netting, is easy to attach to the waist of the skirt with a sewing machine or needle and thread. In addition to being easy to work with, the fabric is inexpensive and does not fray when cut, making it an ideal textile. Once the tulle is attached, consider adding a liner between your legs and the tulle, as the fabric can be rough on skin.
Things You'll Need
Flip your skirt inside out to expose the interior waistband. You will attach the tulle directly to the waistband so that the skirt poofs outward at an even slope.
Sew the tulle onto the waistband using a sewing machine set to a large zigzag stitch, or thread a needle with nylon thread. Begin sewing at the interior seam of the waistband and work your way around. Do not worry about the length of the tulle; you will trim it at the end. When using a needle and thread to sew, work the needle through the individual netting holes.
Flip the skirt to the "right" side. Use fabric scissors to trim the tulle so it is even with, or slightly above, the hem of the skirt.
Add additional tulle if you want the skirt to poof out further. To prevent too much tulle at the waist of the skirt, you will sew the tulle onto the middle of the first tulle layer. Mark the area where you want to sew tulle with fabric chalk or a small magic marker. The spot will not be seen because it is inside the skirt. Measure upward from the bottom of the tulle to the same distance in several areas inside the skirt. This will ensure the second layer of tulle is even throughout.
Use a needle and thread to sew the second layer of tulle to prevent the tulle from ripping. Work your way around the interior tulle until the second layer is complete. Trim the second layer just like the first layer.