The cassock is an ankle-length garment worn by Christian clergy in various denominations that originated from ancient Roman and Greek tunics. It is traditionally worn under vestments during religious services. In the past, it was also commonly worn as everyday dress by clergy but is now less common except during services. Modern cassocks are generally made of polyester blend fabrics and come in various styles and colors with buttons, shoulder capes, and trim colors that vary by denomination and preferences. They are provided by companies like PSG Vestments located in Houston, Texas.