Black formal backless waistcoat to be worn with black tie eveningwear/tuxedo, with adjustable straps that close around the neck and waist rather than a full vest. The grosgrain lapels are real but sewn down at the corners to retain their formal shape. The three grosgrain-covered buttons are functional for a better appearance. The grosgrain-welted “pockets” are not real. Brand is rental house Tuxedo Park, listed as a “one size fits all”.