Have you heard of Sister Sizes but never really understood what the term meant? 

Here's a sample breakdown and keep in mind that any of these alternate sizes should work just as well!! 

32b = 30c, 34a 
34b = 30d, 32c, 36a
36b = 32d, 34c, 38a
38b = 32e/dd, 34d, 36c, 40a

Here's a chart for easy reference!

Use the chart by finding your bra size and moving directly above or below

Much like swapping clothes with your sisters, a sister-size bra has all the necessary functions with a different size label. In a bra, the band and cup sizes work symbiotically. The cup volume is an essential factor in a well-fitting bra. Sister sizes are plural for a reason. Each bra size can have multiple sister sizes, although our recommendation is to stick with the two closest sizes. 

Repeat after me. If you size up the band, the cup size will go down. If you size down the band, the cup size will go up. (Have you caught on to what’s going on here?) The bra and band work inversely when calculating Sister Sizes. 

If you are a 34B and are looking for your sister sizes, remember that you have options. Either you size up the band and go from a 34 to a 36, or you size down the band and go from a 34 to a 32. Now --- don’t forget that we need to make some adjustments to the cup sizes as well! If you’ve decided to size up to a 36, you need to size down the cup (going from a B cup to an A cup). 

Let’s pause a bit to discuss why this makes sense. If you increase the width of the band, you naturally have more fabric/space to work with, so by decreasing the size of the cup, your breasts will sit better/more comfortably. 

Okay -- so, what if you decided to size down from a 34 to a 32? Not a problem. Change the cup size from a B to a C, and you’re all set! (With a smaller/tighter band, your breasts may feel suffocated in the same cup size, so by sizing up the cup, you’re giving your breasts more room to settle in.

Remember that your bra size may differ slightly depending on the brand or type of bra. Every manufacturer is unique, just as you are. It's quite normal if it may take some trial and error to find the perfect fit. If you are unsure, please buy several sizes! We offer an excellent return/exchange policy, so please don't hesitate. We are here to ensure that you shop wisely and happily!!

Another essential tidbit to consider is that while menstruating, our bodies go through quite the process. Often seeing the effects via physical changes to our bodies (e.x. bloating, weight gain, and etcetera), it can be quite helpful to keep an array of sizes in your wardrobe to help accommodate the beautiful changes that occur.

Pearlle strives to provide comfortable and well-fitting intimates. We believe knowledge is power; With this insight, we’re confident that you’ll be able to find the right bras for your body.