Trade theory provides a comprehensive introduction to designing, constructing, and finishing garments, from foundational sewing techniques to advanced tailoring skills. Students learn to take accurate body measurements, interpret and adjust patterns, select fabrics, and operate sewing machines. Courses typically cover garment construction elements, including seams, darts, hems, and zippers, as well as finishing techniques like pressing, hand-stitching, and embellishment. By the end of the course, students create various types of garments and gain confidence in creating custom-fitted clothing, enabling them to pursue personal projects or explore a career in fashion and garment production.