Bra Size Guide: Understanding 30B and Finding the Right Fit

Based on the provided measurements, your cup size is likely to be 30B, not B28. To determine your cup size, you need to subtract your underbust measurement from your bust measurement. In your case, 30 inches - 28 inches = 2 inches. Referring to a bra size chart, a 2-inch difference corresponds to a B cup size.

As for finding a bra in size A that would fit you, it's important to note that cup sizes are not directly interchangeable between different bra sizes. While you may have a 30B bra that fits well, a 28A bra may not necessarily be the right size for you.

To find the correct bra size, it's recommended to try on bras in different sizes and styles to determine the best fit. Keep in mind that bra sizing can vary between brands, so it's always a good idea to refer to the specific brand's size chart or consult with a professional bra fitter for accurate recommendations.