Interfacing is a process used in garment manufacturing to help give structure, shape and firmness to certain areas, such as the facings, hems, and collars on shirts, coats and jackets. There are two types of interfacing to use. Sew-in and fusible interfacing are both popular choices and each has its own positive points and reasons to use.
In addition to the two major types of interfacing, there are variations in the weight of this extra layer with a choice of light, medium or heavy weight. Plus, the type of weave can vary from the knit, woven or non-woven options. It is critical to use the right type of interfacing to match the specific application.
Sew-in or fusible interfacing
Here is an overview of the different interfacing techniques:
The fusible interfacing method is the most basic and the preferred choice for the complete beginner learning sewing skills. It relies on a heavy adhesive on one side to give a permanent hold to the collar or hem when applied using an iron. The steam and heat of the iron combine to activate the adhesive.