Instructions
Research your interfacing options before starting your project. Many stores do not offer a complete selection, so go online to find a comprehensive assortment. The three major types of interfacing are woven, non-woven and knit, and they can range in thickness from light to heavyweight. Interfacing is also available in stretch or stable, and it can be fused or sewn.
Determine whether the fabric you will be using for your project requires fusible or sew-in interfacing. Some fabrics, such as sheers, faux-fur and sequined fabric, cannot withstand high heat or do not bond well with a fusible interfacing.
Cut out your interfacing according to the pattern. Pin and baste it into place on the wrong side of fabric, and trim off any excess bulk around the seams. Interfacing is usually applied to only one of the fabric pieces, such as one piece of the collar. Sew the garment, making sure to catch the seams of the interfacing.
Follow the directions carefully when working with fusible interfacing. Select interfacing that has the same basic care requirements as the fabric with which you intend to sew, and be sure to test the interfacing and fabric first.