Though the cummerbund is a well-known part of black tie, Bond has only worn a cummerbund on a handful of occasions. Traditionally, one isn’t wearing a cummerbund because he’s wearing a waistcoat or a double-breasted dinner jacket, but those situations do not make up the rest of Bond’s black tie outfits. Bond is well-known for omitting the waist-covering altogether, but Bond wears the seemingly pointless piece of silk around his waist a few times.
According to Black Tie Guide, the cummerbund originated from coloured sashes that British officers wrapped around their waist in India. Now cummerbunds ordinarily come in the form of a piece of pleated silk—with the pleats worn facing up—in the front that connects in the back with a strap and buckle. The purpose of the cummerbund is to act as a formal waist-covering that wears cooler than a waistcoat. It covers the bottom of the shirt front and the trousers’ waistband, so it serves an aesthetic purpose if not a practical one. The cummerbund is not a belt and does not hold up the trousers, so there is no rule about not wearing a cummerbund with braces. Braces can be worn with a cummerbund just the same as they can—and should—be worn under a waistcoat. Bond wears both a cummerbund and braces in Licence to Kill and Skyfall.
The cummerbund is traditionally black and matches the bow tie in both colour and texture, but it can be other colours. Burgundy is the most common choice for a coloured cummerbund, but the bow tie should always be black no matter the colour of the cummerbund. Coloured matching bow tie and cummerbund sets are often sold and can be worn for “creative black tie” functions and high school proms, but if you’re trying to follow the elegant example that Bond sets the bow tie should always be black. After all, it’s called “black tie”. The only time Ian Fleming mentions Bond wearing a cummerbund it’s a “wine-red cummerbund” that he wears with his white dinner jacket and dress trousers in the Thunderball novel. Since the bow tie isn’t mentioned, we can assume that Bond wears a proper black bow tie. The first time Bond wears a cummerbund in the films it’s a fancy silk in burgundy and black in Diamonds Are Forever. It’s a flashier 1970s take on the “wine-red cummerbund” that Fleming writes about, but the bow tie is still black. It’s the only time in the series that Sean Connery wears any sort of waist-covering with black tie.
In For Your Eyes Only, Bond wears trousers with a sort of waistband that acts like a cummerbund. The waistband is very wide, flat silk that extends across the entire front and fastens with two buttons at the right side. It’s a little narrower than a real cummerbund, but it’s a clever design and acts like a built-in cummerbund. The same type of built-in cummerbund returns in Octopussy. It may not be a proper cummerbund, but it’s a step in the right direction.
The first time Bond has a traditional black, pleated cummerbund is in Licence to Kill. It’s one of the few redeeming qualities of the black tie outfit in that film. But actually there are two cummerbunds used. The one Bond removes is flat silk and is used with the purpose to conceal rope. But later when Bond wakes up at Sanchez’s villa and sees his dinner suit neatly hung up, it’s the traditional cummerbund with pleats.
When Bond wore his dinner suit without a cummerbund or waistcoat in Casino Royale, many people took note of it and started doing the same. Though Bond’s tradition of foregoing the waist-covering began from the start of the film series in Dr. No, it took 44 years for people to notice and make a big fuss over it. When Bond returned in Quantum of Solace two years later, the cummerbund returned. And Bond wore a cummerbund again in Skyfall despite the cummerbund not being very popular at the moment.
The cummerbund does not work well with the low-rise trousers that make up the majority of suit trousers today since the cummerbund should be worn up at the waist and not down at the hips. Some people say that the cummerbund should be used with such low-rise trousers to prevent the white of the shirt from showing between the jacket button and the top of the waistband, but that’s not a true solution for a poorly-designed suit. The cummerbund’s purpose is not to prevent that bit of shirt from showing. The jacket’s buttoning point and the trousers’ waistband in a well-fitting suit should not be very far from one another. The cummerbund should actually be mostly hidden under the jacket and only show just a little above and below the jacket’s button, if it shows at all.