A Cummerband is a sash worn around the waist, especially as part of a man's formal evening suit. The Primary Purpose of waist Cummerbund is that it acts as a waist covering, whereas a tuxedo cummerband is used to prevent your shirt from showing below the buttoning point of your jacket. It is believed that by ensuring your shirt only shows at the chest in a powerful V-shape, a stronger and more masculine look is achieved. A tuxedo cummerbund avoids any distracting white from popping out below. These are Traditionally Black in color whereas other colors can also be worn including gold, burgundy, bottle green, as well as white. The widest part of the tuxedo cummerbund is the front, where it can more effectively conserve warmth. Traditional tuxedo cummerbunds are made of quality silk material, while less expensive options will be made from synthetic materials like polyester.