Wool serge is a sturdy and durable woolen fabric, which is commonly used for making suits and coats. It is a twill weave fabric that has a diagonal ribbing texture, making it resistant to wrinkles and creases. Wool serge is highly valued for its warmth, durability, and practicality, making it a popular choice for outdoor wear. Some synonyms for wool serge include worsted wool, tweed, and flannel. Worsted wool is a smooth and thin fabric made from long-staple wool fibers, while tweed is a rough, textured woolen fabric that is often used for traditional Scottish clothing. Flannel is another type of woolen fabric that is soft and warm, often used for blankets and winter clothing.