Which sewing technique is used for adding fullness to a garment?

Gathering is the sewing technique used to add fullness to a garment. This method involves sewing long, loose stitches along the fabric and then pulling these threads to create soft pleats or ruffles. Gathering allows for the creation of fluid, flowing shapes in designs, making it popular for skirts, blouses, and other garments where added volume enhances the overall look and drape.

The other techniques do not serve the purpose of adding fullness in the same way. Pinning is a method used to hold fabric pieces together temporarily before sewing, while drafting pertains to creating patterns and measurements for garment design. Hemming is the process of finishing the edges of fabric to prevent fraying and give a clean look, but it does not contribute to the fullness of the garment itself.