Which stitch is available for jean alterations?

The normal stitch is commonly used for jean alterations because it provides a strong and secure seam that can withstand the stress and strain of denim fabric. This type of stitch is effective for sewing thicker materials like denim, ensuring that the alterations remain durable over time. Normal stitching also allows for consistent and neat seams, essential for maintaining the aesthetic qualities of jeans after alteration.

In contrast, the other stitch types have specific functions that may not be ideal for denim. For example, a blind stitch is generally used for hems and is designed to be invisible from the front side of the garment. A straight stitch is more straightforward and used for basic sewing but may not offer the same durability in high-stress areas as a normal stitch. The zigzag stitch is flexible and allows for some stretch, which can be useful in knit fabrics but does not provide the same strength and structural integrity required for jean alterations.