The Ups and Downs of Sister-Sizing

So you're standing there in a bra that is way too tight in the band but the cups fit well. Let's say it's a 38C. Well, you would go get a 40C, right? Wrong! The size of a cup in one band does not equal that same letter in another band, i.e. the 38C cup does not equal the 40C cup. This is where sister-sizing comes in. Understanding how it works will make your shopping easier.

Essentially, sister-sizing means that if you increase the size number of the band, you must decrease the letter of the cup to maintain the same cup size. So, in our example above you would want to search for a 40B instead of a 40C. Conversely, if you decrease the size number of the band, you must increase the letter of the cup.  In our example, if the 38C was right in the cup but the band was too loose, you would search for a 36D.

Factories developed this relationship between cups/bands so that they would not need to make a huge variety of cups.  With this method they have roughly 7 (A-G) cup sizes attached to 7 different bands (32-44). These efficiencies reduce costs for the factory and you!

Hopefully, this clears up some confusion while bra shopping- reducing frustration and time. Of course, I would love to help you find the right fit. My fittings are fast (ave 15 min.) and free.  Call me for an appointment today! 224-619-7890.

Stay Perky!
Heide