Knit vs. Woven Fabric at a Glance
Nearly every fabric you’ll come across is built one of two ways: woven, where threads cross over and under each other at right angles, or knitted, where a single continuous yarn is looped through itself in connected rows. That one structural difference is behind most of the practical differences people notice between fabrics — stretch, how the edges fray, drape, and how a garment fits.
As a general rule, woven fabrics (think denim, poplin, chambray) hold their shape and don’t stretch much unless the yarn itself has some elastane blended in. Knit fabrics (think T-shirt jersey, sweater knits, tricot) have natural give because the interlocking loops can flex before the yarn itself has to stretch.
How Woven Fabric Is Made
Woven fabric is produced on a loom using two sets of yarn: the warp, which runs lengthwise and is held under tension, and the weft, which is passed over and under the warp threads crosswise. The specific pattern of over-and-under crossing — plain weave, twill, satin, and so on — determines the fabric’s texture, strength, and how it drapes.
Because the threads are locked in a fixed crossing pattern, woven fabric generally doesn’t stretch much along its length or width unless stretch fiber is added to the yarn itself. It also tends to fray at a cut edge, since the crosswise threads aren’t looped around anything to hold them in place.
How Knit Fabric Is Made
Knit fabric is built from a single continuous yarn (or set of yarns) that’s looped through itself in connected rows, rather than two sets of threads crossing at angles. Each loop, called a stitch, hooks into the loop above or beside it, which is what gives knit fabric its characteristic stretch and softer drape.
There are two broad families of knit construction: weft knitting, where loops form across the width of the fabric row by row (this is how most T-shirt jersey and sweater knits are made), and warp knitting, where loops run in a zigzag along the length of the fabric, producing a flatter, more run-resistant structure. Tricot is a common example of a warp knit — our guide to tricot fabric goes into that construction in more detail.
Is Denim a Knit or Woven Fabric?
Conventional denim is a woven fabric, specifically a twill weave, which is what gives it that diagonal ribbed texture on the surface. The twill weave is also part of why denim resists abrasion reasonably well and holds a crease.
That said, “knit denim” or “denim-look” fabrics do exist on the market — these are knit fabrics printed or finished to resemble denim’s color and texture, often used for more stretchy, legging-style garments. So while true denim is woven, not everything sold as “denim fabric” necessarily is, and it’s worth checking the fabric content or feeling for stretch if you’re unsure which you have.
How to Tell if a Fabric Is Woven or Knitted
A few quick checks can usually settle the question without needing a label:
- Stretch test: Gently pull the fabric in different directions. Knit fabric generally has noticeable give, especially widthwise. Woven fabric without added stretch fiber will resist pulling in any direction.
- Look at the edge: Cut or torn edges of woven fabric tend to fray into loose threads. Knit fabric edges are more likely to curl or run rather than fray into individual strands.
- Look closely at the surface: Woven fabric shows a visible crisscross pattern of threads running at right angles. Knit fabric shows columns of small interlocking loops (these are called wales), which can be easier to spot by stretching the fabric slightly.
- Check the structure under tension: If you pull a single yarn and the whole area around it puckers or a loop unravels down a column, that’s a strong sign of knit construction. Woven fabric generally won’t unravel that way.
Common Fabrics, Sorted by Construction
Some fabrics are reliably one or the other, while others — often because the name refers to a fiber rather than a construction — can be made either way:
- Usually woven: chambray, poplin, twill, broadcloth
- Usually knit: jersey, tricot, double knit, jacquard knit
- Can be either, depending on fiber and construction: rayon
A few of these come up often enough in searches that we’ve covered them individually: see our guides to whether rayon is knit or woven, whether chambray is woven or knit, whether poplin is woven or knit, and jacquard double knit fabric.
Why the Difference Matters for Sewing and Knitting Projects
Patterns are usually designed with one fabric type in mind, and swapping in the other construction can change how a finished piece fits. A pattern drafted for woven fabric typically includes design features like darts, zippers, or buttonholes to accommodate a body without relying on fabric stretch, while a knit-fabric pattern often assumes the fabric’s own give will do some of that work.
Needle and thread choice can matter too — a stretch or ballpoint needle designed for knit fabric is less likely to snag the loops of a knit, while a sharp needle generally suits woven fabric’s crossed threads better. Checking which construction you’re working with before cutting into fabric can save a project from fitting or finishing problems later.