What is the function of interfacing in sewing?

Interfacing is used in sewing primarily to strengthen and stabilize specific areas of a garment or textile project. This can be crucial in areas that require structure, such as collars, cuffs, waistbands, button plackets, and other components where extra support is needed. Interfacing comes in various forms, including fusible and non-fusible, and can be chosen based on the fabric type and desired outcome.

The correct choice highlights the foundational role of interfacing in ensuring that these parts of a garment hold their shape and maintain a polished look over time. Utilizing interfacing effectively can enhance the durability and overall quality of the finished product, making it an essential component in garment construction. In contrast, the other options do not accurately reflect the primary purpose of interfacing. While additional warmth can be achieved through layering fabrics, this is not a direct function of interfacing. Similarly, adding color can be a property of a fabric or a design choice, but it is not the primary role of interfacing. Lastly, aiding in design visualizations may refer to how certain materials give structure during the design phase, but it does not encapsulate the core function of interfacing itself.