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First of all, we had to. We couldn’t possibly use the typical sizing system of number + letter for young girls with barely-there boobs when it doesn’t even work well for many women with been-there-awhile boobs.
Not to mention, we wanted to! The only alternative - using words like small, medium, and large - creates a system that's weirdly judgey, not to mention these terms mean absolutely nothing when it comes to boobs.
The OOMBRA size system is super simple: Your OOMBRA size = the number of inches around your chest measured at the biggest part of your boobs.
No boobs yet? No problem! Got boobs? Then we’ve got you covered at least until your chest is more than 38”. And hopefully soon, we’ll cover more than that.
In bra lingo, the measurement we use is called the overbust. This is the number of inches around your chest at its biggest point, including your nipples. To get your sizing right:
👁 Find the right spot to measure, which is where the nipples are (it's called the "nipple line").
📏 Wrap a measuring tape around at the nipple line, trying to keep the tape at the same level on the back and front sides.
🤔 Don’t have a measuring tape? Use anything that wraps easily, so long as it doesn't stretch - you can use a phone charging cord, a long piece of twine or masking tape. (Materials with elastic can stretch, leading to under-measuring.) Remove whatever was wrapped around the body, lay it flat on a surface, and measure the length using a ruler.
🚫 Don’t pull tight!! Boobs need room to be comfy.
⬆️ Always size up! OOMBRA sizes are a range of measurements. So, for instance, a 30-32 fits anyone measuring anything between 30-32. A person who measures 32 should choose OOMBRA size 32-34. When on the cusp between sizes, choose the bigger size for sure!
Even though OOMBRAs only rely upon one measurement – the overbust – for sizing, we do use the underbust in our design. And some people actually have a bigger underbust than overbust, especially when boobs first start to grow. Check out this chart to convert your bra size (number/letter in the square) to your OOMBRA size (color of each square). It's as easy as that!