This harness is made of a simple neutral coloured cotton elastic. The harness pictured here has antique brass coloured clasps and a matching ring at the back however silver hardware is also available (see my black harness for an image of the silver buckles). Since the harness is made of elastic it will fit quite a few people, however I'm calling my standard size a small/medium. The elastic measures 26" around the ribcage, unstretched, and will stretch comfortably up to 30". If you need the fit to be tighter, let me know as this is a fairly easy adjustment to make. If you need a larger size shoot me a convo, I'm always open to making custom sizes, equal fashion for all!