Twill is a type of weave that is easily recognisable by its pattern of parallel, diagonal ribs. Weavers achieve this distinctive look by passing a weft thread under one or more warp threads, then over two or more warp threads and so on, with a “step” (offset).
Twill fabrics have been around for a long time, and this should come as no surprise, as they are versatile, durable, and look chic without being flashy. They also have a softer hand feel than plain weave fabrics. Twills usually have a high thread count, so the fabrics are more water- and weather-resistant. The most popular fabrics woven using a twill loom are denim, herringbone, and houndstooth. They not only look different, but are also used for very diverse purposes in the fashion industry.
As most shirting fabrics, twill can be washed in a washing machine at 40°C, but not tumble-dried. It also can be dry cleaned if needed. For best results when ironing use a hot iron, on the reverse side of the shirt. Drying twill garments laid out flat helps minimise the need for ironing.
Dress shirts made from twill are sturdy, but still pleasant to wear. They usually are thicker than, say, poplin, but also softer. Softness allows the twill fabric to relax easily after creasing, so your shirt will look sharp longer. Another pro of twill fabrics is that they do not stain easily. However, if stained, they are harder to clean. It is worth remembering that due to the high thread count and its thickness twill is a little bit less breathable than simpler weaves.