The Difference Between a Weave and a Knit

Two ways to make cloth

Almost every fabric you wear is built in one of two ways: it is either woven or knitted. This is the most basic fact about a cloth, more fundamental even than its fibre, because it decides how the cloth stretches, holds its shape, and falls. Yet many people never learn the difference, and so cannot say why a woven shirt behaves so differently from a knitted top. It is a simple distinction with far-reaching consequences.

How a weave is built

A weave is made of two sets of threads crossing over and under each other at right angles, like a basket. One set runs the length of the cloth, the other runs across, and they interlace to make a firm, stable fabric, as in a cotton shirt or a wool suit.

• Threads cross at right angles, over and under
• The structure is firm and stable, with little natural give
• The cloth holds its shape and takes a crisp line
• Cut edges will fray, because the threads are only interlaced, not locked

A weave is stable because the crossing threads hold each other in place. This is why woven cloth is the choice for tailoring: it holds a shape, keeps a pressed crease, and falls in a controlled line, because the structure does not give unless cut on the bias.

How a knit is built

A knit is built completely differently: from a single yarn looped through itself, row upon row, like a hand-knitted jumper but usually much finer. Each loop is caught through the loops around it, and it is those interlocking loops that give a knit its character. Think of a soft top or a jumper.

A knit is loops of yarn caught through one another, and loops can stretch and recover. That is why a knit gives when you pull it and springs back, moving with the body in a way a stable weave never can.

Because it is made of loops, a knit stretches in every direction and returns, moulds to the body, and drapes soft and close. It does not fray at a cut edge the way a weave does. The whole nature of a knit, its give, its softness, its close drape, comes from that looped structure.

How they stretch and hold

The biggest practical difference is stretch. A weave has little give of its own and holds a firm shape; a knit stretches and recovers and moves with you. This single difference explains most of how the two behave in wear.

A woven garment sits where it is cut, holding its line, which is why a woven skirt keeps its shape. A knitted garment gives as you move and springs back, which is why a knit top is so comfortable and follows the body so closely. When you want structure and a held shape, you want a weave; when you want comfort and a close soft drape, you want a knit. Neither is better; they are answers to different needs, and most wardrobes want both.

How they fall

Weaves and knits drape differently too, and knowing this helps you predict how a garment will hang. A weave falls in a more structured way, holding folds and keeping a line, its stability showing in a crisper, more architectural drape. A knit falls soft and close, following the body's curves, its give letting it mould rather than bridge.

This is why a woven dress and a knitted dress of the same shape look so different on: the woven one skims and holds its own line, the knitted one follows every contour. It is also why a knit is more forgiving of movement, while a weave holds its shape and relies on its cut for ease. Knowing whether a garment is woven or knitted tells you at once whether it will hold its shape away from the body or fall close and follow it.

Telling them apart

You can tell a weave from a knit easily once you know what to look for, and it is worth learning to check. Look closely at the surface. A weave shows threads crossing at right angles, a grid of over-and-under, often with a visible warp and weft. A knit shows rows of little interlocking loops, often like tiny V shapes or a chain.

Stretch a corner gently. A weave gives very little except on the diagonal; a knit stretches and springs back readily in the direction you pull. Feel the two and the difference in character is plain: the weave is firmer and more stable, the knit softer and more elastic. With a moment's look and a gentle pull, you can classify any cloth, which tells you at once how it will stretch, hold and fall.

Why it is worth knowing

Knowing whether a cloth is woven or knitted is one of the most useful pieces of fabric knowledge because it predicts so much. It tells you whether a garment will hold its shape or follow the body, whether it will give as you move or stay put, whether it will keep a crisp line or drape soft and close, even whether a cut edge will fray or not.

This is why the distinction is worth carrying with you. When you understand that a garment's whole behaviour flows from this basic choice of structure, you read clothes more clearly. You know a woven trouser will hold its tailored line and a knit one will move with you. Two ways to build a cloth, two entirely different sets of behaviour, and once you can see which is which, you understand the foundation on which every other quality of a fabric is built.