There are two components to the bra size - the band size and the cup size. These two variables should be examined seperately:
Band size:
Firstly fasten the bra on its largest setting. It should feel very firm around your ribcage, but not tight or painful. When you try to stretch the bra out from your chest, it should only stretch by an inch or so at the front and a couple of inches at the back. Try to fit your fist under the band of the bra at the back. It should be a tight fit. If you can stretch it out further, then the band is too large. For example, if you are wearing a 36" bra and you can stretch it out by several inches, you need to try a 32" or smaller.
Cup size:
The cups should be filled out, but there should never be any bulges over the top or sides of the bra. If you trace along the underwire with your finger, it should follow the natural crease of your breast and sit firmly on your ribcage, not on soft breast tissue. If you can feel the underwires digging into the sides of your breasts under your armpits, or if they do not lie flat against your chest in the middle, then you need a bigger cup size.
Combining your band and cup size:
If your band size is correct and you need to change the cup size, then all you need to do is go up or down a letter. However, if you need to change the band size, then you will still need to change the cup size as well, even if they are already the correct size. This is because cup sizes are in proportion to the band size, so a 36C bra has bigger cups than a 34C. If you're wearing a 36C and you need to try a 34 or 32 band, you will need to try a 34D or 32DD.
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There are two components to the bra size - the band size and the cup size. These two variables should be examined seperately:
Band size:
Firstly fasten the bra on its largest setting. It should feel very firm around your ribcage, but not tight or painful. When you try to stretch the bra out from your chest, it should only stretch by an inch or so at the front and a couple of inches at the back. Try to fit your fist under the band of the bra at the back. It should be a tight fit. If you can stretch it out further, then the band is too large. For example, if you are wearing a 36" bra and you can stretch it out by several inches, you need to try a 32" or smaller.
Cup size:
The cups should be filled out, but there should never be any bulges over the top or sides of the bra. If you trace along the underwire with your finger, it should follow the natural crease of your breast and sit firmly on your ribcage, not on soft breast tissue. If you can feel the underwires digging into the sides of your breasts under your armpits, or if they do not lie flat against your chest in the middle, then you need a bigger cup size.
Combining your band and cup size:
If your band size is correct and you need to change the cup size, then all you need to do is go up or down a letter. However, if you need to change the band size, then you will still need to change the cup size as well, even if they are already the correct size. This is because cup sizes are in proportion to the band size, so a 36C bra has bigger cups than a 34C. If you're wearing a 36C and you need to try a 34 or 32 band, you will need to try a 34D or 32DD.
When your boobs kinda bulge out at the front. When you wear a tight top, do you get like lumps at the front, that means it too small. If you don't think that it covers enough of your boob, you could say that too. Its depends on how fast your boobs grow. If you've quite young, like I am, then I find myself buying a new bra every few months because they're growing quite fast. I'm 17 and now I'm a 34 E/F. But older ladies tend to not need to as often. If you haven't replaced your bra in the past 4 months, you should probably buy a new one. Best way to tell is go and try the next cup size up in a shop! If you think it fits better, than yeah!
if your breast meat is hanging out the top. and the bra is not covering what its suppose cover.