Women often think they are the same bra size up top for most of their life, but that is just not true. It is also fairly common that women never have gotten fitted before. It is a good idea that when you go shopping for bras to get fitted every time you go. At a minimum you should get fitted for a bra twice a year (every 6 months). And don`t be shy about being fitted for a bra.
Just because you have been wearing the same size, its more than likely that you shouldn't be. For one manufactures change how they fit, and a lot of natural changes in life that will change your fit such as pregnancy, weight gain, illness, holidays, exercise, and age, just to name a few.
The best way to be fitted is just to go the a department store and be fitted there for free. Even then different people measure differently as well. It isn't a bad idea to be fitted by multiple stores too. It isn't a good idea to be fitted at Victoria's Secret either. They mostly cater to the smaller size.
If you feel like you can do it yourself, here is where you should start: You will need a measuring tape, take it a start by measuring around just underneath the bust line (around your rib cage) and exhale if you want a snug fit, this will be your band size. Round to the next whole number. Make sure the tape measure is parallel to the ground
Next you will want to measure your cup size. Make sure you are not wearing a padded bra. Make sure the tape measure is parallel to the ground and measure the fullest part of your bust (across the nipple) without pulling tight. Make sure you round to the next whole number.
Next take the band measurement and subtract it to your bust measurement and this will be your cup size. Every inch difference, go up a cup size. 1” would be an A cup, 2” a B, and so on. If your cup size is greater than a D, different manufacturers will classify your cup size differently, so you may have to try different cup sizes when you fit bras.
Also you should know that the size of the cup will increase along with the band size, and vice versa. For example, the cup of a size 36C bra will be bigger than the cup of a size 34C bra.
The mistake many make is settling for a bra size that's close enough, rather than holding out for one that's perfect. How to know if you've got an ideal model? The most important consideration is comfort. Here's what to check for next:
• While putting on the bra, bend over and allow your breasts to fall naturally into the cups. Stand slowly and adjust the bra: Put a hand to each breast and raise the nipple so that it's at the center of the cup. The center of the bra should lie flat against the breastbone. Be sure there is no gap.
• Check that the bra cups are smooth, with no wrinkles.
• Finally, turn to the side and look in a mirror to see whether the back of the bra hikes up. If it does, then the bra doesn't fit correctly. The back of the bra should rest comfortably against the middle of your back.
• The band should be snug on the loosest hook so that when the band stretches, you can continue to tighten it and get more life out of your bra.