What is one function of seam allowances when sewing curved seams?

Seam allowances play a crucial role when sewing curved seams as they create even tension across the seam. This is important because curved seams require the fabric to bend and conform to a specific shape. Without proper seam allowances, the tension on the fabric could become uneven, potentially leading to puckering or distortion of the seam.

By having enough seam allowance, a sewer can ensure that the fabric is distributed evenly along the curve, allowing for a smoother and more professional finish. This even tension helps the fabric to lie flat and fit together as intended, which is particularly important in garment construction and other sewing projects where shape and fit are vital.

Other choices do not address the primary function related to maintaining the integrity and appearance of curved seams. For example, while snipping fabric can help reduce bulk at curves, it does not directly pertain to the intent of the seam allowance itself.