What technique involves trimming each layer of fabric to different widths to reduce bulk?

The technique that involves trimming each layer of fabric to different widths to reduce bulk is known as grading. Grading is essential in sewing and garment construction, especially when working with multiple fabric layers, as it helps to ensure that seams lie flat and the overall shape of the garment is smooth. By reducing the bulk at the seams, grading allows for a cleaner finish and more comfortable wear. This technique is particularly important when working with curved seams, as it allows for better maneuverability and helps maintain the intended design shape without excess fabric causing unnecessary tension or discomfort.