Twill fabrics are identified by their distinctive diagonal weave that creates a rib pattern that gets more recognizable as the yarns get thicker. Once you know what to look for, twill leaps out at you: in chinos (a.ka. khakis), denim jeans, the collar on that old-school rugby you still regret handing off after college.
For dress and formal occasions twill is great for adding subtle texture to your ensemble. And it’s extremely durable and doesn't wrinkle easily - making it ideal for casual shirts that get put through the paces on active weekends: Leaf raking, gutter cleaning, wood splitting, waxing the convertible before you put it to bed for winter. If it’s a job that’s gotta be done, it’s gotta be twill