What is blue serge fabric?

Blue serge is a type of twill fabric that is woven with a diagonal pattern. It is usually made of wool or a wool blend, but can also be made with cotton or other fibers. The fabric is known for its durability and strength, making it popular for workwear and uniforms. It is also commonly used for suits, jackets, and trousers. Blue serge fabric is usually dyed a deep navy blue color, but can also be found in other shades of blue. The name "serge" comes from the Latin word for "silk." However, modern serge fabrics do not contain silk fibers, but rather are made from synthetic or natural fiber blends.