What type of seam is generally recommended for fabrics that stretch?

An elastic seam is specifically designed to accommodate the stretch of elastic fabrics, allowing the seam to maintain its integrity and elasticity when the fabric is pulled or stretched. This type of seam is often constructed using a combination of stitching techniques that enable the fabric to move without the seam becoming tight or breaking.

When working with fabrics that have elastic properties, such as knits or certain types of activewear fabrics, using a seam that provides flexibility is essential for the garment's comfort and performance. The elastic seam allows for movement and conforms to the body’s shape, making it the ideal choice for these types of materials.

In contrast, other types of seams like the French seam or flat-felled seam are more suitable for non-stretch fabrics. They create a finished look and are used primarily for durability and neatness rather than allowing for stretch. A straight seam, while versatile, doesn't provide the flexibility needed for stretchy fabrics, potentially leading to breakage or puckering when the material is under tension.