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Variance in bra sizes

There are several sizing systems in different countries.^[28] Most use the chest circumferences measurement system and cup sizes A-B-C+, but there are some significant differences. Most bras available usually come in 36 sizes,^[29] but bra labeling systems used around the world are at times misleading and confusing. Cup and band sizes vary around the world.^[30] For example, most women assume that a B cup on a 34 band is the same size as a B cup on a 36 band. In fact, bra cup size is relative to the band size, as the actual volume of a woman's breast changes with the dimension of her chest.^[30][31] In countries that have adopted the European EN 13402 dress-size standard, the torso is measured in centimetres and rounded to the nearest multiple of 5 centimetres (2.0 in).
A number of reports state that 80–85% of women are wearing the wrong bra size.^{[2][32][33][34]} A correctly fitted bra is determined by accurately calculating the chest size (or band size) and breast volume (the cup size). The band size can be adjusted slightly using the two or three alternate sets of fastening hooks and eyes in the clasp. The bra straps (over the shoulders) can usually also be adjusted slightly.

Types of bras

 

There is a wide range of brassiere styles available, designed to match different body types, situations, and outer wear. The degree of shaping and coverage of the breasts varies between styles, as do functionality, fashion, fit, fabric, and color. The most common bra styles are built on a square frame model with the main components being a chest band that wraps around a woman's torso, two cups to hold the breasts, and shoulder straps.

Common types include backless, balconette, convertible, shelf, full cup, demi-cup, minimizing, padded, plunge, posture, push-up, racerback, sheer, strapless, t-shirt, underwire, unlined, soft cup, and sports bra. Many designs combine one or more these styles. Bras are built-in to some garments like camisoles, single-piece swimsuits, and tank tops, eliminating the need to wear a separate bra.

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