Cup size

When it comes to understanding bra cup sizes, the process involves taking two main measurements: the overbust and the underbust. The overbust is the circumference of the chest measured around the fullest part of the breasts, while the underbust is measured directly below the breasts.

1. Overbust Measurement: Measure the circumference around the fullest part of your chest.
2. Underbust Measurement: Measure around your chest directly beneath your breasts.

By subtracting the underbust measurement from the overbust, you get the difference, which helps determine the cup size. For example, if the difference is three inches, you might be a C cup.

However, it’s important to note that sizing can vary between brands and countries, making it complicated to find the perfect fit 1 2.

Various brands have different systems for cup sizes, and adjustments in band size (like moving from a 34C to a 36B) can also affect how the cups fit, a concept known as "sister sizing" 1.

For the most accurate results, professional measurement is often recommended over at-home measuring, especially considering the complexities and inconsistencies in the bra sizing industry 2.