Every woman with breasts - regardless of whether she is a transsexual or a genetic 'girlgirl' - benefits from a well fitting bra. These benefits are almost too numerous to list but the most important are probably appearance, comfort, reduced back strain and reduced sagging.
Just how great some of these benefits are in reality has recently been argued over extensively, with the context that Homo Sapien women survived without bra's for maybe 200,000 years. However few modern women would voluntarily give up their bra. This page makes the assumption that a well fitting bra is a good thing, and that a badly fitting bra is ... well ... a bad thing.
It will be of no great surprise to readers to learn that a woman's breasts come in all shapes and sizes. Breast size and shape is most commonly described using classifications developed by the lingerie industry and brassiere manufacturers. Unfortunately these "standards" are often confusing and far from consistent. I will attempt here to provide guidance for women in the UK and Ireland, but some may be applicable in a broader context.
A) Determining your Bra Size
A well fitting bra should have:
Good support: cups that fit all the way around each breast and keep them from sagging, straps that don't have to carry so much of the weight that they dig into your shoulders, not only permanently indenting them but adversely affecting circulation to and from the arms. One factor is choosing wide-enough straps, so they're not so thin that they cut, another is a properly fit cup.
Good coverage: modesty is an influence in how the cups should fit, with the exception of some deliberately immodest cup styles. Halters and bathing suits come to mind here, because they're outer garments and must be made more modest. Always be thinking about not only your audience, but whether this garment is to be used as an outer garment.
Snug-enough chest band: this should not, as with straps, dig into your flesh, it should be snug enough to still be snug enough at the end of a long day, but not bind and dig. When the chest band is too snug, it also draws the underwire into your ribs and will bend them along the lower cup side or the bottom, digging them into your ribs. By the end of the day, this has been shear torture. The band should fit well enough not to slide around long your chest. If you can put the band on backwards and slide it round your chest to the front, it's too loose. Wear a smaller size or use the next-smaller row of eyes.
Underwires that don't poke: if the underwire is poking under the arm it may be too long, a possible solution being to find or alter a design in which the cup side is a little lower, or use a slightly less deep (maybe by nipping and retipping) wire in that style or pattern of bra. Also, if the cup side seam is too far forward, as with a too-small cup size, the wire will poke your arm, even more so if it's too deep. This can also result from a wire that's too wide, moving the tip too far under your arm and poking you. If the underwire at the centre front does not lie flat, but comes out at an angle from your body or curves or is anything but vertical along the chest wall at centre front, it's not right. Adjust the straps, or find a style or size of bra in which the centre front ends of the underwire will lay flat against the centre of your chest and be snug enough, with enough cup room and support to be comfortable and effective without digging or sagging, poking or bulging anywhere.
To see if your bra is suited to your bust type (low, high, full, etc.), try this test: Stand in front of a mirror. Tie a string around your waist. Hold something straight (like a yardstick or even a pencil) horizontally at your collarbone (the two bones at the base of your front neck). The fullest part of your bosom should be no lower than mid-chest level, halfway between the string and the stick. If your bosom is closer to your waist, you need a bra that will lift your bosom. (Many women think they are short-waisted when they are just low-bosomed.) Next, place your finger on the cleavage area of your bra and press. You should not be able to bounce your finger in and out; if you can, your bra cups are too small. Then feel along the front edges of your bra and down the seam under your arm. Are there any bulges? If so, you need a larger cup.
Breasts are usually asymmetrical, meaning that one woman's breast may be a different size or shape than her other breast. Interestingly, a woman's left breast is usually a little larger then her right breast, though this is only a generalization. The woman shown has a left breast that is larger than her right breast, in fact, many of the photos above show breast asymmetry.
Inverted nipples are also quite common and are not a problem unless they cause difficulty during nursing. Special nipple cups can be used to help during lactation. A nipple that previously was not inverted but then became inverted is a warning sign of breast cancer and needs to be brought to the attention of a doctor:
Atlas of Cup Sizes
Just for fun, the image below claims to show the average bra size of women around the world. I suspect that it is very inaccurate!
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