10B Bra Size Collection | The Foundation
Understanding the 10B Bra Size
The 10B bra size is a specific fit in the Australian bra sizes system. The '10' refers to the band size, which fits snugly around a 65cm underbust. The 'B' cup reflects the cup volume, designed for those with a bust measurement of approximately 77–79cm. Compared to a 10C, it offers a shallower fit with less projection. Compared to an 8B, the 10B has a slightly looser band, offering a more relaxed fit around the torso while maintaining the same cup volume. This makes 10B ideal for petite frames seeking comfort and shape without compromising support.
Bra Size Conversion Table
Use this handy bra size conversion table to find your match across regions—especially useful if you love shopping international lingerie brands. Many global labels use different sizing systems, so knowing your equivalent size helps you find your best fit, whether you're shopping from Europe, the UK, or the US.
| Region | Equivalent Size |
|---|---|
| UK | 30B |
| US | 30B |
| EU | 65B |
| FR | 80B |
How to Measure
Our bra sizing guide is here to help you find the correct bra size using a soft measuring tape:
- Band Size: Wrap the measuring tape snugly around your ribcage, directly under the bust. Make sure the tape is level and in position. If it reads 65cm, your band size is 10.
- Bust Measurement: Measure around the fullest part of your chest. Ensure the tape is parallel to the floor.
The difference between bust and band size determines your cup size. A 12-14cm difference generally indicates a B cup.
Understanding Sister Sizing
If your size isn’t available in a certain style, sister sizing is your secret weapon. Sister sizes have the same cup volume but vary in band fit:
These alternate sizes help if you're in-between sizes or seeking different support levels. Our expert fitters are happy to assist if you're unsure.
Best Bra Styles for a 10B Fit
The Foundation offers a comprehensive range of bra styles tailored to your shape:
- Wireless bras: Maximum comfort for daily wear
- Lightly padded styles: Natural enhancement with subtle shape
- Seamless designs: Invisible under clothing—perfect for fitted outfits
- Stick-on bra size options: Ideal for strapless or backless looks
For style inspiration, explore customer favourites like the Simone Perele Delice Strapless Bra Blush or Chantelle Basic Invisible Covering Memory Bra Skin in 10B.
Available Brands in 10B Size
Explore our finest range of bras from globally trusted names in lingerie:
- Chantelle
- Calvin Klein
- Passionata
- Wacoal
- Royce
- Berlei
- Lingadore
- Marie Jo
- PrimaDonna
- Simone Perele
- Triumph
These brands range from timeless classics to trend-forward designs. Bestsellers like the Marie Jo Avero Padded Balcony Bra and the Wacoal Embrace Lace Bralette are especially popular in size 10B, thanks to their superior fit and versatile styling. Each piece is crafted to suit Australian bra sizing standards and support your every movement.
Shop Bras in 10B
Whether you’re after reliable daily support or something sleek for special occasions, our 10B bra collection has it covered. From everyday underwear essentials to elegant pieces, you’ll find it here. Every product is carefully curated for quality, style, and long-lasting comfort.
Use filters to sort by brand, padding, style, or occasion. It’s the easiest way to find your perfect match faster.
Shop Now to experience lingerie tailored to your shape, comfort, and lifest
FAQs
What is a 10B in Australian bra sizes?
A 10B corresponds to a 65cm band size and a 77–79cm bust measurement.
What is my sister size if 10B is unavailable?
Try 8C for a tighter band or 12A for a looser band—both have the same cup volume.
How do I know I’m wearing the correct bra size?
Use a measuring tape to check your body measurements. Ensure the tape is level and not too tight or loose. If in doubt, visit us in-store for personalised fittings.
Can I use this guide for stick-on or strapless bras?
Yes. Stick-on bra sizes follow the same bra size systems, but fit may differ by brand and style.
Where can I find a full lingerie size guide?
Visit our Lingerie Size Guide for help with bust, waist, and hip measurements. Our team is also available to assist online or in-store.