The term 'Fabric with Diagonal Ridges' can be summarized as a type of fabric that has diagonal ridges or lines running across it. The crossword solution for this term is 'Serge', which is a type of twill fabric that has diagonal ridges or lines running across it. Serge is a strong, durable fabric that is often used in upholstery and clothing. It is also commonly used to make military uniforms.