Why are bras measured in cups
Traditional bra sizing consists of two measurements, the BAND size (chest size), and the CUP size (chest size). Both band size and cup size result from measurements, but are not measurements themselves.
What's my band size?
Tape sizes are EVEN NUMBERS only and are determined by adding a 4, 5, or 6 to the "underbust" or chest measurement., A tape measure wrapped around the entire chest in inches just below the bottom of your breasts is your bib number. If the number is even add four or six, and if the number is odd add five to get your band size. Your band size is not the bra measurement because an elastic bra stretches more than non-elastic. A band size 36 elastic bra can measure 27 inches in length, while a less elastic size 36 bra can measure 33 inches in length.
What's my cup size?
Cup size is determined by the relationship between the measurement around your breasts (bust size) with the measurement below (or above) your breasts. Bust measurement two to four inches larger than chest measurement is usually an A cup, three to five inches larger is a B cup, four to six inches larger is a C cup, five to seven inches larger is a D cup, and so on . You can see there are areas and overlaps, and the cup size also depends on the bra style and pattern., Many cup sizing schemes are inaccurate for some women, in part because of the wide range of breast shapes and variety of bra types and fabrics. Dr. Edward Pechter, a plastic surgeon, accurately determined the cup size by measuring it directly over the chest.
For women with a 36 band size, the chest, which is 7 inches wide, is an A cup, 8 inches a B cup, 9 across its fullest part from the lateral origin under the arm to its inner end near the sternum Inches a C cup and so on., Adapting to the fact that cup size varies with band size (the C cup of a 36 bras is larger than the C cup of a 34 bras but not as big as the C - cup of a 38 bra), one-half inch is added or subtracted from the chest measurement for each band size, up or down. For example, if a chest width of 9 inches is a C cup for 36 band size, a chest width of 8.5 inches is a C cup for 34 band size, and a chest width of 9.5 inches is necessary to fill a C cup for a woman with 38 band size.,
Conventional Bra Size Chart:
Pechter's method of determining bra size and predicting post-augmentation breast size:
The Pechter method determines bra cup size by direct measurement of the chest.,
For a 36 band size, a breast circumference from the outside fold to the inside ending the breast over the meridian of the largest circumference (usually over the nipple) of 7 inches corresponds to an A cup, 8 inches to a B cup, 9 inches to a C cup , 10 inch AD cup, !! inch a DD cup, and 12 inch an E cup. In Dr. Edward Pechter's original study of 100 subjects, his cup size technique was consistent with a woman's own estimate of her cup size 84% of the time, and the traditional method (above) of bra measurement only agreed with each subject's estimate in 23% of the cases.
Bra size is determined by two measurements, band size and cup size.
The band size is expressed as a number, while the cup size is represented by a letter (A, B, C, etc.)., The traditional method of determining cup size does not rely on direct measurement of the breasts, but rather relates the circumference of the breast immediately below the breasts to the circumference of the breast around the fullest part of the breasts. The most common bra sizing method is to measure the tape measure by wrapping tape tightly around the chest just below the breasts. Five inches is then added to that number. If the number is odd, it will be rounded down to the next highest even number (as bras are only offered in even numbered sizes).,
For example, if the bust measurement under the bust is 29 inches, the band size is 34 (29 + 5). If the underbust bust is 32 inches, the band size is 38 (32 + 5 = 37, rounded up to the nearest even number = 38).
Chest circumference is determined by measuring the distance around the chest loosely with tape across the fullest part of the breasts, usually at the level of the nipples, with the woman wearing an unpadded bra. The cup size is then calculated by taking the difference between the bust and the underbust plus five measurements.,
A difference of 3 inches corresponds to an A cup, 4 inches to a B cup, 5 inches to a C cup, 6 inches to a D cup, and so on. For example, a woman with a 38-inch chest and a 34-inch band size (29-inch underbust chest + 5-inch) would be a B cup (38-34 = 4-inch difference = B cup).
In the study by Dr. Pechter, the bra cup size was measured by conventional means and compared to measurements directly above each breast., This measurement was the horizontal distance across the skin of each bare breast with a tape from the lateral (outer) breast fold to the medial (inner) breast fold.
For women with a band size 36, a measurement of 7 "equals an A cup, 8" equals a B-cup, 9 "equals a C-cup, etc., with each one-inch increment determining one cup size up or down. Every time the belt size changes by two or two, the cup size measurement in inches increases or decreases by half an inch.,
Therefore, a 34-band size woman is a C-cup if the measurement above her chest is 8.5 inches. With small or firm breasts, the circumference can easily be measured while standing. Women with large or flabby breasts are measured more accurately in the supine (supine) position.
The point where the breast mound begins laterally can sometimes be more easily identified with the woman's arms raised., Gently pushing the chest outward sideways or inward medially will help define the chest folds for an accurate measurement.
The video below shows a clear delineation of the medial (inner) edge of the chest (fold) when it pushes upwards and slightly inwards on breasts. The same pressure on the chest defines outer (lateral) chest folds. It is from the inner to the outer fold that the measurement in inches will most accurately determine the correct cup size as described above.,
In his study of 100 women, Pechter's method was accurate for over 80% of women and was never reduced by more than a cup size. Traditional cup size methods gave results that were smaller than those reported by female volunteers, often by two or more cup sizes.
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