Which fabric is known for its medium weight and twill pattern, often used for raincoats?

The fabric known for its medium weight and twill pattern that is often used for raincoats is gabardine. Gabardine is a tightly woven fabric that features a distinctive diagonal ribbing due to its twill weave. This structure provides durability and water resistance, making it an ideal choice for outerwear such as raincoats.

Covert, while it may have some similar qualities, is typically heavier and not as commonly associated with raincoats. Satin and canvas serve different purposes; satin is smooth and typically used for more formal garments, while canvas is heavier and more rugged, suitable for items like bags or outdoor gear rather than waterproof raincoats. Gabardine, by contrast, strikes the right balance of weight and function for such garments.