Cummerbund

A Broad Pleated Sash at the Formal Waist

A cummerbund is a broad waist sash, usually pleated, worn around the midsection as the waist covering of a formal outfit. Its job in black tie dress is specific. A dinner jacket is worn open or fastened low, a dress shirt front ends at the trouser waistband, and without a covering the junction of shirt, waistband and belt would show as an untidy break in the outfit's line. The cummerbund covers that junction with a wide, smooth band of fabric, usually in the same black silk family as the jacket's lapels and the bow tie, so the torso reads as one continuous formal surface from chest to leg. It serves the same position a waistcoat serves in other formal dress, but as a sash rather than a garment: lighter, cooler and simpler, with no front, no buttons and no pockets of its own.

The pleats are the cummerbund's signature feature, and they have a set orientation and a traditional explanation. It should be worn with the pleats facing up, to hold ticket stubs, such as coat check and theater tickets. The upward-facing pleats form a series of shallow horizontal pockets across the front, and the ticket-stub story, whether or not it was the pleats' first purpose, has become the standard way the detail is remembered and taught: pleats up, like a tray, not down like a waterfall. The pleats also do visual work, giving the broad sash a ribbed texture that catches light in bands and keeps a wide expanse of black fabric from looking flat. Worn pleats-down is considered a basic error of formal dress, one of the small mistakes that stands out precisely because the rest of black tie is so codified.

From Colonial India to Black Tie, and a Second Meaning

The cummerbund's route into the tuxedo wardrobe ran through empire. It was first adopted by British military officers in colonial India, where a broad sash worn around the waist was part of local and military dress suited to a hot climate, and later spread to civilian use. The logic of the adoption is easy to see: officers dining formally in India needed the waist coverage that a waistcoat provided in Britain, but a full waistcoat in tropical heat was a burden, and the sash gave the same finished waist with a fraction of the cloth and warmth. Brought home and absorbed into evening dress, the cummerbund kept that advantage. It remains the cooler alternative to a waistcoat with black tie, and a matter of personal and regional preference in formal dressing, with the sash and the low-cut waistcoat standing as the two accepted waist coverings of the code.

One word, two trades: cummerbund is also an informal word used in SCUBA to mean a wide waistband on a diving stability jacket, a buoyancy control device designed to provide more comfort to the user than a standard waistband and usually made of a stout fabric backed with Velcro fastenings. The borrowing is a compliment to the sash's defining qualities, breadth and secure wrap. In both uses the cummerbund is a wide band that wraps the waist and distributes pressure or coverage across it rather than concentrating it in a narrow belt. In formal dress the band is pleated silk worn with black tie, bow tie, shirt studs and cufflinks; in diving it is stout fabric and Velcro. Keeping the formal meaning primary, the sash's rules are simple to state: wear it at the natural waist, covering the trouser waistband, pleats facing up, matched in color and fabric to the rest of the black tie outfit.