A jacket is a waist length layering garment for the upper body. A jacket typically has sleeves, collar and fastens in the front or slightly on the side. A jacket is lighter, fitted, and less insulating than a coat.
Synthetic fabrics are textiles made from man-made rather than natural fibers. Eg polyester, acrylic, nylon, rayon, acetate, spandex, latex, Orlon and Kevlar. Synthetic fabrics have many different qualities which are not achievable with natural fibers, eg synthetic fabric can provide waterproof fabrics and elastic fabrics for swimwear and underpants.