is traditional, or the same silk as the jacket's lapels, which is more popular. When a waistcoat has lapels, they are faced in the same silk as those of the jacket; in this case it is considered more refined if the body is made from the same fabric as the jacket. The buttons may be self-faced or covered in the same silk as the lapels. Vintage waistcoats were sometimes closed with studs made from onyx or mother-of-pearl, which were often surrounded by a setting of silver or gold. A waistcoat is never worn with a double-breasted jacket. Since this style of jacket is never unbuttoned, the waist of the trousers is never exposed, and therefore does not need to be covered, though before World War II an edge of the waistcoat was often shown between the jacket and shirt. Cummerbund A cummerbund may be worn with a dinner jacket in lieu of a waistcoat and, although it is considered slightly less formal, it is equally correct. It looks especially well with a shawl collar dinner jacket but may be worn in conjunction with peak lapels. The material of the cummerbund should be silk satin, grosgrain, also called faille, or barathea to match that of the bow tie. It features upward-facing folds, which were originally used to store theatre or opera tickets, and are now considered to be more decorative than functional. Just like the waistcoat, cummerbunds are not worn with a double-breasted jacket. As the cummerbund is seen as an extension of the trousers, traditionally it is the same colour, i.e. black. However, the Black Tie Guide endorses deep and rich colours as a tasteful way to introduce some colour into an outfit that is otherwise monochromatic. Bright colours, such as those often worn by members of wedding parties, should be avoided and the bow tie must remain black in any case. Some higher quality models feature a hidden pocket and an elastic loop to fasten to the trousers. Shirt Dress shirts designed to be worn with black tie are sometimes called "tuxedo shirts" in American English. Traditionally, the shirt is white, has a bibbed front that is either marcella or pleated, a turndown collar, and double, or "french" cuffs. In the early-20th century, a piqué shirt with a detachable wing collar and single cuffs such as is worn with white tie was used, and in the 1960s and 1970s