If you have ever pulled on a favourite pair of jeans or buttoned up a crisp pair of chinos, you have already met twill fabric. Twill is the workhorse weave behind so many of the clothes we live in, yet a lot of sewists are not quite sure what it actually is. In this guide I will walk you through what twill fabric is, how that handsome diagonal line gets woven in, how it differs from a plain weave, and the practical tips you need to sew and care for it with confidence.
What Is Twill Fabric?
Twill fabric is a cloth woven with a distinctive diagonal pattern of parallel ridges running across its surface. Those ridges are called wales, and they are the telltale sign you are looking at a twill rather than a flat, smooth cloth. Run your fingertip across a pair of jeans and you can both see and feel that gentle diagonal grain. That is twill, plain and simple.
The diagonal comes from the way the threads interlace. Instead of going over one thread and under the next in a tidy checkerboard, the crosswise yarn floats over two or more lengthwise yarns, then tucks under one or more, and each new row shifts the float over by one thread. Repeat that step across the whole cloth and the floats line up into a slanting rib. Because those floats let the yarns pack in tightly, twill tends to be denser, stronger, and more drapeable than a flat weave of the same weight.
Twill is usually described with a fraction such as 2/1 or 3/1. The top number is how many threads the yarn passes over, the bottom is how many it passes under. A 3/1 twill, common in denim, shows mostly warp on the front and mostly weft on the back, which is exactly why your blue jeans are deep indigo on the outside and pale on the inside.
How The Diagonal Is Woven
Picture a simple loom. The lengthwise threads held under tension are the warp; the crosswise thread carried back and forth on the shuttle is the weft. In a twill, the weft passes over a set number of warp threads and under another set, and crucially the starting point steps over by one warp thread on every single pass. Row one might start its float on warp thread one, row two on thread two, row three on thread three, and so on. Stack those stepped floats and your eye reads them as one continuous diagonal line travelling up the cloth.
That stepping direction is worth noticing. A right-hand twill runs its wales from the lower left up to the upper right, like the letter S, while a left-hand twill runs the other way, like the letter Z. Denim is traditionally a right-hand twill. If you ever want to understand the bones of any woven cloth, twill included, it helps to know your warp from your weft, and I cover exactly that in our guide on warp and weft, the heart of fabric weaving.
Common Twill Fabrics You Already Know
Twill is a family, not a single fabric, and you almost certainly own several members of it. Here are the ones you will reach for most often at the cutting table:
- Denim: a sturdy cotton twill, classically a 3/1 right-hand weave, dyed indigo on the warp and left white on the weft. That is what gives jeans their blue face and pale back.
- Chino: a lighter, smoother cotton twill that is piece dyed, so it is the same solid colour on both sides. Softer than denim and lovely for trousers and shirt dresses.
- Gabardine: a tightly woven, warp faced twill with a steep, crisp diagonal on the face and a smooth back. A classic for tailored coats, trousers, and trench coats.
- Drill: a strong, medium to heavy cotton twill used for workwear, uniforms, and tote bags. Think of it as a hard wearing cousin of chino.
- Herringbone: a twill that reverses its diagonal direction at regular intervals, creating that lovely zigzag that looks like the bones of a fish. Common in suiting, jackets, and wool coats.
Twill Vs Plain Weave
The easiest way to understand twill is to set it next to the plain weave, the simplest structure of all. In a plain weave each weft thread goes over one warp and under the next, alternating evenly, with no step. The result is a flat, balanced, often crisp cloth: think quilting cotton, poplin, or a simple shirting. If you want the full picture of that smooth structure, our poplin fabric guide is a good companion read.
Twill behaves differently in ways that matter at the machine. Because the yarns float and pack closely, twill is generally stronger and more abrasion resistant, drapes more softly, recovers from creases better, and hides dirt and small stains because the broken diagonal surface scatters the light. The trade off is that the diagonal can show a direction, so a twill is not always reversible and sometimes needs to be cut all one way. A plain weave is flatter and easier for a true beginner, but twill is what you want when you need a garment to wear hard and hang well.
How To Sew With Twill Fabric
Twill is genuinely friendly to sew, which is part of why beginners are so often pointed toward it. A few small adjustments will give you clean, professional results every time.
Mind The Diagonal And The Nap
The diagonal wale can catch the light differently depending on which way the fabric is turned, and many twills, especially brushed or napped ones like moleskin backed twill, have a subtle nap. Before you cut, lay all your pattern pieces in the same direction so the diagonal and any sheen run the same way across the finished garment. It is the same care you would give a directional print, and it keeps two trouser legs from looking like they came from different bolts.
Choose The Right Needle And Thread
Match the needle to the weight. A light chino sews beautifully with an 80/12 universal, while a heavy denim or drill is far happier with a 90/14 or 100/16 denim or jeans needle, which has a strong shaft and a sharp point to punch through the dense weave. Use a good all purpose polyester thread, and consider a heavier topstitching thread for that classic jeans look.
Use The Right Foot And Press As You Go
Thick seams and bulky intersections can make your machine baulk. A walking foot feeds the layers evenly and saves a lot of grief on heavier twills, and a hump jumper or a few hand turns of the wheel will carry you over chunky seam crossings. Press firmly with steam at every stage. A well pressed twill seam lies flat and crisp, and that pressing discipline is what separates a homemade look from a handmade one.
How To Care For Twill
Most cotton twills are wonderfully practical to live with. Prewash your fabric before cutting, because cotton twill can shrink noticeably on its first wash and you want that shrinkage to happen on the flat yardage, not in your finished trousers. After that, machine wash in cool to warm water and tumble dry on low, or line dry to extend the life of the colour.
Wash darker twills like indigo denim inside out and with like colours for the first few washes, as the warp dye can crock and rub off onto lighter pieces. Wool twills such as gabardine and many herringbones prefer dry cleaning or a careful hand wash and a press with a pressing cloth. Twill resists wrinkles well, so a quick steam usually refreshes a garment without a full ironing.
Best Sewing Projects Using Twill
Because twill is hard wearing and holds a shape, it shines in projects that need a bit of body and structure:
- Trousers and skirts: chino and lightweight denim are perfect for everyday bottoms that need to hold their shape through a long day.
- Jackets and coats: gabardine and herringbone give tailored outerwear that crisp, structured hang.
- Bags and totes: cotton drill and heavy denim make sturdy, long lasting bags that stand up on their own.
- Aprons and workwear: the abrasion resistance that makes twill great for jeans also makes it ideal for kitchen and craft aprons.
- Home decor: twill upholstery weight cloth covers cushions and ottomans that take real daily wear.
Denim is the most beginner friendly twill to start with, and we have a whole tutorial dedicated to taming it on your home machine. If you are about to cut into your first piece of denim, read our tips for sewing denim, easier than you think before you begin. You might also enjoy seeing how twill compares to a true pile fabric in our velvet fabric guide.
When you are ready to put your twill to work, browse our free sewing patterns for a project that suits a sturdy, structured cloth. A simple tote, an apron, or an easy skirt is a lovely way to get comfortable with the weave.
Want a few yards to practise on? You can find cotton twill or chino fabric by the yard in a rainbow of solid colours, which is a budget friendly way to test the weave before committing to a special project.
Twill rewards a little understanding. Once you can recognise that diagonal wale, choose the right needle, and press with care, you will reach for it again and again for clothes and projects that genuinely last. Happy sewing.
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