- Knit vs woven: Knit fabrics are created from interlocking loops, giving them inherent stretch and elasticity, unlike woven fabrics that rely on yarn crimp. This loop structure allows knits to conform to three-dimensional shapes, making them ideal for garments that require movement and body contouring.
- Weft vs warp knitting: Weft knitting, the most common method for hand and machine knitting, forms loops horizontally across the fabric width. Warp knitting creates vertical loops and is typically done by industrial machines, producing ladder-resistant fabrics but less elasticity.
- Gauge definition: Gauge refers to the number of stitches and rows per inch. It directly determines fabric density, thickness, and drape. A looser gauge yields a softer, drapier fabric, while a tighter gauge produces a denser, more structured material such as for cables or colorwork.
- Stitch and row counts: Standard gauge measurements are taken over a 4-inch swatch. For example, a worsted-weight yarn may produce 20 stitches and 28 rows over 4 inches. Changing needle size or tension alters these numbers, which must be accounted for in pattern design.
- Loop anatomy: Each knit stitch consists of a head, legs, and a loop that pulls through the previous row. The arrangement of these loops creates the characteristic V-shaped columns. Understanding how loops interlock helps predict fabric stability and edge behavior.
- Fabric bias and distortion: Knit fabrics can bias (twist) if stitches are not balanced, especially in single-bed knitting. This happens when stitch tension is uneven or when yarn twist causes the fabric to lean. Designers must account for bias in garments to avoid cutting and sewing misalignment.
- Fabric roll and curl: Stockinette stitch naturally curls at edges due to the difference in purl and knit tension. This behavior influences edge finishing choices: ribbing, garter stitch borders, or blocking can minimize curl. Designers use curling edges intentionally in some designs, like rolled hems.
- Elasticity and recovery: Knit fabrics stretch under tension and return to original shape when released. The degree of elasticity depends on yarn type, fiber content, and stitch pattern. Ribbing and garter stitch have high recovery, whereas lace or cables have less, affecting how garments hold shape over time.
Principle: Fabric Structure Determines Garment Behavior
Definition: The interlocking loop geometry of knit fabrics creates anisotropic properties: fabrics stretch more in one direction (width) than the other (length). This directionality must be aligned with garment forces: for example, body circumference needs horizontal stretch, so the knit fabric's widthwise stretch should match the body measurement.
Application: When designing a fitted sweater, use a fabric with high horizontal elasticity (like ribbing or a tuck stitch) to allow ease over the bust and hips. For a structured cardigan that holds its shape, use a denser stitch pattern (like seed stitch or cables) to reduce stretch and provide rigidity. Always test a swatch in the intended stitch pattern to measure stretch percentage and recovery.
- Knit fabrics are built from interlocking loops, giving them stretch and shape-conforming ability.
- Weft knitting is common for hand and machine; warp knitting is more stable.
- Gauge (stitches and rows per inch) directly controls fabric density and drape.
- Loop anatomy and bias affect fabric behavior; stockinette curls at edges.
- Elasticity and recovery vary by stitch pattern and fiber, influencing garment fit and longevity.