# The Sisterhood of the Traveling Bra Cups

## from Kellie K Apparel

Recently a friend of mine came to me for help. She was interested in our strapless bras, but had problems finding a bra that fit her well. She had been for a fitting, but the band felt too tight and cups weren’t comfortable. When she went up a band size she found that she had problems with the cups not fitting. I measured her while we discussed her fit preferences. I sent a quick text to our designer to double check my math then told her she measured 30E.

Her response, “There’s no way I could be an E cup. That’s huge!”

My response, “Right now you’re an E cup and an A cup and ever letter in between.”

She was confused. So I explained cup sizes aren’t consistent by letter, they’re consistent by band size. The larger the band size the larger the cup. Intuitive, no! Confusing, yes!

Let’s try some examples to clarify. You wear a 34D, but you think the band is too tight. If you try on a 36D, the cups will most likely be too big. You’ll see gaping at the top or feel unsupported. To get the same cup volume as your 34D bra, you’ll need a 36C. Let’s say the band in the 34D is too loose, a 32D would have cups that are too small. You’d need a 32E to keep the same cup size as the 34D. This is called the sister size. A sister size is when cups have the same volume, but different band sizes. It’s also how you could fit into the cups of a 40A, 38B, 36C, 34D, 32E, 30F.