Which is considered the number one rule of pressing in sewing?

The number one rule of pressing in sewing emphasizes the importance of properly pressing seams before proceeding with sewing over them. Pressing seams helps to set the stitches and shape the fabric, which can significantly influence the overall appearance and fit of the finished garment. By pressing seams towards the garment, the fabric lays flatter and prevents unwanted puckering and distortion.

Effective pressing allows for more accurate sewing, as it ensures that the fabric is in the correct position and that the seams align properly. If a seam is not pressed before being sewn over, it can lead to difficulties in achieving accurate stitching and may negatively affect the garment's finish. Therefore, this rule serves as a foundational practice in sewing, promoting better quality and precision in the final product.

Using steam, pressing towards the garment, and pressing only after completion are all important practices, but the foundational rule of pressing effectively before proceeding makes a significant difference in the construction of the garment.