Textures are neither especially rough nor smooth. To achieve a semiformal effect, textures can be modestly uneven or dimensional. They can be simply smooth without being especially lustrous. Rug and carpet surfaces may be smooth or carved in patterns. Patterns may be large in scale, delicately drawn, crafted by hand, or made of luxurious materials.
Most formal patterns are extravagant in some way.
Some types of designs have a classically formal feeling. This is true of damask and brocade fabrics, Aubusson and Savonnerie rugs, most Oriental rugs, as well as most fine-patterned porcelain. In a formal room, textures are basically smooth and shiny. Soft, smooth surfaces in general create a luxurious comfort quotient. Imagine deep pile rugs, generous upholstered pieces, fabric on the walls.