Stitches per inch (SPI)
Stitches Per Inch (SPI): A Key Indicator of Sewing Quality Meta Description: Stitches per inch (SPI) refers to the number of stitches within a 1-inch length of fabric. Learn how SPI affects seam strength, garment quality, and fabric durability in sewing. What is Stitches Per Inch (SPI)? Stitches per inch (SPI) is a measurement that …