Satin has an inherent evening quality that makes it one of the most reliable fabrics for Christmas party dressing. The sheen catches indoor lighting in exactly the right way, the fabric moves well, and a well cut satin dress reads as occasion appropriate without requiring embellishment or complicated styling. A satin midi or a satin slip dress in a strong colour has all the festivity the occasion requires built into the fabric itself. These are not dresses that need anything added to them to work. They work because the material and the silhouette are doing exactly what they should be doing.