in volume than a D cup on a 34 band, as the volume of a woman's breast increases as her chest band dimension increases. In countries that have adopted the European EN 13402 dress-size standard, the measurement is rounded to the nearest multiple of . International manufacturing standards and measurement systems vary widely. Bras are designed for an ideal body, but women's anatomy vary widely. Ten percent of women's breasts are asymmetrical, with the left breast being larger in 62 percent of cases. One woman's breasts may be ptotic and widely spaced, another's might be centered closely on the chest, upright, and very full. As a result, finding a correctly fitting bra is extremely difficult. When women find a bra that appears to fit, they tend to stay with that size, even though they may lose and gain weight. In a survey in the United Kingdom, 60 per cent of over 2,000 women between the ages of 16 to 75 said they had had a bra fitting, and 99 per cent said that fit was the least important factor when selecting a bra. Increased publicity about the issue of poorly fitted bras has increased the number of women seeking a fitting. The UK retailer Marks & Spencer stated that about 8,000 women are fitted for bras in their stores weekly. Despite this, about 80–85 percent of women still wear the wrong bra size. Bra experts recommend professional bra fittings from the lingerie department of a clothing store or a specialty lingerie store, especially for cup sizes D or larger, and particularly if there has been significant weight gain or loss, or if the wearer is continually adjusting her bra. Women in the UK change their bra size on average six times over their lifetimes. Signs of a loose bra band include the band riding up the back. If the band causes flesh to spill over the edges, it is too small. A woman can test whether a bra band is too tight or loose by reversing the bra on her torso so that the cups are in the back and then check for fit and comfort. Experts suggest that women choose a band size that fits using the outermost set of hooks. This allows the wearer to use the tighter hooks as the bra stretches during its lifetime. Styles Bras may be designed to enhance a woman's breast size, or