This twill weave material is used for expensive suits and outer wear

The correct answer is A: gabardine.
Let's break down why:

Gabardine: This is a tightly woven twill fabric.
Its distinct diagonal rib pattern makes it durable and water-repellent.
These qualities make it perfect for high-quality suits and outerwear like coats and trench coats.

Linen: This is a fabric made from flax fibers.
It's known for being lightweight and breathable, more suitable for summer clothing than suits or outerwear requiring structure and water resistance.

Velour: This is a plush, knitted fabric similar to velvet.
It's soft and comfortable but not typically used for structured suits or heavy-duty outerwear.

Pellon: Pellon is a type of interfacing or stabilizer.
It's used inside garments to provide structure and support, but it's not the actual outer fabric of a suit or coat.

Therefore, gabardine is the best choice for expensive suits and outerwear because of its twill weave, durability, and water resistance.