Which sewing technique requires specific seam allowances for various fabric types?

Flat-felling is a sewing technique where two pieces of fabric are sewn together in a way that creates a strong, durable seam that is also flat and neat on the outside. This method is commonly used in garments like jeans or shirts, as it provides both strength and a finished look. The technique involves trimming one seam allowance and folding the other over it before stitching it down, which requires specific seam allowances to achieve the desired appearance and effectiveness.

Different fabric types may necessitate different seam allowances due to factors like thickness, drape, and stretch of the fabric. For instance, heavier fabrics might need wider seam allowances to accommodate the bulk and ensure stability, while lighter or more delicate fabrics may require narrower allowances to avoid additional bulk and maintain a clean finish. Understanding these requirements helps ensure that the seams are not only strong but also complement the design and functionality of the finished piece.

In contrast, other techniques mentioned may not have such specific requirements regarding seam allowances across different fabric types, making flat-felling the most suitable option for this question.