What is the standard seam allowance recommended for commercial sewing patterns?

The standard seam allowance recommended for commercial sewing patterns is five eighths of an inch. This measurement strikes a balance between providing enough fabric to create a strong seam while still allowing for adjustments and alterations if necessary. Many commercial patterns are designed with this allowance because it works well for a variety of fabric types and garment styles, ensuring that seams are both durable and neat.

The other choices represent seam allowances that might be used in specific situations or with certain types of fabrics, but they do not reflect the general standard used in commercial patterns. For instance, a one-inch seam allowance may be applied in making garments that require substantial strength or when working with bulky materials, while a half-inch seam allowance could be suitable for finer, delicate fabrics where less bulk is desired. A one-fourth inch seam allowance is typically reserved for very lightweight fabrics or when making hemmed edges but is not the norm for overall garment construction. Thus, the five eighths of an inch seam allowance is established as the industry standard for ease of sewing and ensuring quality in finished garments.