Measuring For The Band

• To get the proper fit, you will need to take two measurements. The first will determine your band size. Place the tape measure directly beneath your breasts, being certain to keep it level. It may be advisable to take this measurement when not wearing a bra. With larger breasts, it may be necessary to hold your breasts up while taking the measurement. If you are not nimble, you may need to have help taking this measurement.
  
  

Determine The Cup Size

• The second measurement should be taken at the fullest portion of your breasts. Once again, make certain to keep the tape level with the ground for an accurate measurement. On both measurements, round up to the nearest full inch. The difference between these two measurements will determine your cup size.
  
  

Cup Sizes

• If the difference between the two measurements is 4 inches, then you will need a D-cup size. A difference of 5 inches will be a DD or E-cup size, while a 6-inch difference will be either a DDD or an F. Proceeding up, a 7-inch difference is a G cup, 8 inches equals an H, 9 inches is an I cup and a 10-inch difference will be a J cup size.
  
  

Getting The Right Fit

• A large number of women wear a bra that is either too big or too small. The fit of the bra straps can help you determine if you are wearing the proper size. If the straps continually fall or slide off your shoulders, your bra is not the correct size for you. Strap problems should be the exception--anything more indicates a problem.
  
  

Underwire

• Most plus-size bras will have an underwire support. This will offer you better support as well as a more attractive look. If the underwire comes away from the center portion of your chest, this is another indication you have on the incorrect bra size for your build.