st st

Stocking stitch, abbreviated st st, is a fundamental knit structure formed by alternating rows of knit stitches on the front and purl stitches on the back. On the face side, it appears as vertical columns of interlocking V-shapes, smooth and uniform. On the reverse, it shows horizontal bumps. This alternation of knit and purl rows in machine or hand knitting creates a dense, flat fabric with minimal curl at the edges, making it the default choice for seamless garments, hosiery, and weft-knit apparel from t-shirts to sweaters.

In hosiery production, stocking stitch dominates because it produces a fabric with good elasticity and recovery in both wale (vertical) and course (horizontal) directions. The structure allows for straightforward shaping through increases and decreases, critical for sock heels, glove fingers, and shaped sleeves. Machine knit st st runs at high speeds on circular or flat-bed machines, with typical gauge ranging from 10 to 28 stitches per inch depending on yarn weight and end use.

The name itself comes from its historical origin: stocking manufacture in the 16th and 17th centuries established this stitch as the standard for leg wear, and the term persisted as industrial knitting developed. Early frame knitters recognized that this simple alternation of front and back loops outperformed other patterns in durability and fit.

Defects in st st are easily spotted because the structure is visually consistent. Dropped stitches create visible ladders running vertically through the fabric; slack stitches appear as loose loops; and uneven tension between knit and purl rows produces a wavy selvage. Quality control relies on visual inspection and hand-feel assessment, since the smooth face makes tension problems immediately apparent.

Stocking stitch contrasts with garter stitch, where all rows are knit (bumpy on both sides), and with rib patterns such as 1x1 or 2x2 rib, which alternate knit and purl within the same row for high-stretch applications. St st also differs from jacquard or patterned knits, which introduce additional color or structural variation. For heavy-weight fabrics requiring structure without stretch, stockinette-based double knits or terry knits build on this foundation.