The terms "over-bust" and "under-bust" refer to specific measurements used to determine bra size. These measurements help in finding the right fit by accurately calculating the band size and cup size of a bra. Here’s a detailed explanation of each term and how they are used in bra fitting:

Over-bust

Definition:

• The over-bust measurement, also known as the bust measurement, is the circumference around the fullest part of the breasts.

How to Measure:

1. Position: Stand straight with your arms relaxed at your sides.
2. Placement: Place a measuring tape around the fullest part of your bust. This is usually at the nipple level.
3. Fit: Ensure the tape is parallel to the ground and not too tight or too loose. It should sit snugly against your body without compressing the breast tissue.
4. Read Measurement: Take the measurement in inches or centimetres, rounding to the nearest whole number.

Purpose:

• The over-bust measurement helps determine the cup size of the bra. It is combined with the under-bust measurement to calculate the difference, which then corresponds to a specific cup size.

Under-bust

Definition:

• The under-bust measurement is the circumference around the ribcage, just below the breasts.

How to Measure:

1. Position: Stand straight with your arms relaxed at your sides.
2. Placement: Place a measuring tape around your ribcage, directly under your bust where the band of the bra will sit.
3. Fit: Ensure the tape is parallel to the ground and snug but not tight. It should fit comfortably without squeezing.
4. Read Measurement: Take the measurement in inches or centimetres, rounding to the nearest whole number.

Purpose:

• The under-bust measurement determines the band size of the bra. It is the foundational measurement for the overall bra size.

Using Over-bust and Under-bust Measurements to Determine Bra Size

1. Band Size:

   • The under-bust measurement directly translates to the band size. For example, if your under-bust measurement is 34 inches, your band size is likely 34.
   • Some sizing systems recommend adding a specific number to the under-bust measurement to get the band size. For example, if your under-bust measures 32 inches, you might add 4 inches to get a band size of 36. However, this method varies and is less commonly used today.

2. Cup Size:

   • Calculate the difference between the over-bust and under-bust measurements.
   • Each inch of difference typically represents a cup size. For instance:
     • 1 inch difference = A cup
     • 2 inches difference = B cup
     • 3 inches difference = C cup
     • 4 inches difference = D cup, and so on.

Example Calculation:

• Under-bust Measurement: 34 inches
• Over-bust Measurement: 37 inches
• Difference: 37 - 34 = 3 inches
• Bra Size: Band size 34, Cup size C, resulting in a bra size of 34C.

Practical Tips for Accurate Measurement

• Use a Soft Measuring Tape: A flexible, soft measuring tape is best for taking accurate measurements.
• Measure Without a Bra: Ideally, take measurements while not wearing a bra or wearing a non-padded, non-compressive bra to get the most accurate measurements.
• Take Multiple Measurements: Measure more than once to ensure consistency and accuracy.
• Check for Proper Fit: A well-fitting bra should have a band that is snug but not tight, cups that fully encase the breasts without spillage, and a centre gore that lies flat against the chest.

Conclusion

Understanding over-bust and under-bust measurements is essential for finding a well-fitting bra. The over-bust measurement helps determine the cup size, while the under-bust measurement determines the band size. Accurate measurements and the correct calculation of the difference between these measurements lead to a proper and comfortable fit, enhancing both support and appearance.