This means plain satin!

Thick silk fabric with smooth and shiny front: satin | brocade.

Various flowers and plain silk fabrics using satin weave. There are many kinds of satin fabrics, commonly known as satin. In the satin weave, only one of warp and weft covers the surface in the form of floating length, while covering other evenly distributed single weave points. Therefore, the fabric surface is smooth and shiny. Warp satin with warp yarns floating on the whole surface; Full of floating satin. Satin fabric is one of the most complicated silk products with the most colorful appearance and advanced technology. We often have flowered satin, plain satin, brocade, antique satin and so on. Satin, brocade and antique satin can be made into cheongsam, quilt cover and cotton-padded jacket. Its characteristics: smooth and bright, soft texture. Ancient satin and brocade are rich in patterns, colors, fine lines, elegant and magnificent, with national style and hometown color. Most Tang suits are made of this fabric. Song Ming Ying Xing's Heavenly Creature and Naifu: "Every day ... is woven for a few inches, and it is scratched black." This is the word "Duan", and the Ministry of Industry of "Yuan" has a paragraph, and now it is "satin"