8D Bra Size – Find Your Perfect Fit
The 8D bra size is a specific Australian size, where the number "8" represents your band size (measured around your ribcage) and the letter "D" refers to your cup size (based on the difference between your bust and underbust). If your actual underbust measurement is around 68–72 cm and your bust measurement is approximately 88–90 cm, 8D is likely your ideal fit.
This size belongs to the petite band, fuller cup category — offering tailored support and a flattering shape for smaller frames with more bust volume.
International Bra Size Conversion Chart
We get it — bra sizing isn't universal. Here's a handy size conversion chart to show how 8D compares internationally and help you navigate global sizing with ease:
| Region | Equivalent Size |
|---|---|
| Australia (AU) | 8D |
| UK | 30D |
| US | 30D |
| EU | 65D |
| France (FR) | 80D |
This international bra size converter helps you shop confidently across international sizes.
How to Measure Your Bra Size with a Tape Measure
For the perfect size, use a soft tape measure and a mirror:
Band Size (Underbust)
Measure snugly around your ribcage, just under your bust.
Keep the tape level all the way around.
Round to the closest measurement.
Bust Measurement (Overbust)
Measure loosely around the fullest part of your bust.
Ensure the tape isn’t digging in or hanging loose.
Cup Size
Subtract the band size from the bust measurement.
A 12 cm difference typically equals a D cup.
Need help? Our Expert Bra-fitting service is available in-store to guide you. Or try our convenient bra size chart online — it’s quick, private, and designed to help you find your best fit from home.
Sister Sizes & Alternatives
The concept of sister sizing gives you more flexibility in fit. If 8D feels slightly off, try:
- 6DD – Smaller band, same cup volume
- 10C – Larger band, same cup volume
This is especially handy when exploring sizes across brands or adapting to your personal style preferences.
Best Bra Styles for 8D
Our range is curated with comfort and confidence in mind. Here are a few favourite bra styles suited for size 8D:
- Lightly Padded Bras – Subtle shape, great for everyday wear
- Wireless Bras / Wirefree T-Shirt Style – Ideal for casual, no-poke comfort
- Seamless Bras – Invisible under fitted tops
- Balconette Bras – Lift with a flattering neckline
- Full Cup Bras – Higher-support style for secure coverage
Looking for something specific? Shop by style.
Premium Brands Available in 8D at The Foundation
We stock a thoughtful selection of renowned brands known for comfortable lingerie in inclusive sizing:
- Chantelle – Classic French elegance with excellent fit
- PrimaDonna – Known for stylish support in fuller cups
- Simone Perele – Blends Parisian design with softness
- Marie Jo – Flattering cuts for modern shapes
- Empreinte – Sculpting styles that celebrate curves
Our bras are designed for every body — whether you're petite, curvy, athletic, or somewhere in between.
Your Fit, Your Confidence
Finding the correct bra size can be a life-changing experience. At The Foundation, we offer more than products — we provide a supportive, personalised customer service experience to help you feel confident in your skin.
Our expert team is available for fittings, and you can also explore our size chart. Prefer a chat? Contact our friendly customer service team — we typically respond within 24 hours.
Frequently Asked Questions About 8D Bras
What is an 8D in UK sizing?
An 8D in Australian sizing is equal to a 30D in the UK.
Can I wear a 10C if 8D is out of stock?
Yes! 10C is your sister size, offering the same cup volume with a looser band size.
Do you offer free shipping?
Yes, enjoy FREE Australia-wide shipping for orders over $150.
What if my bra doesn’t fit?
We accept returns on eligible items (unworn and unwashed). View our full return policy.
How often should I check my bra size?
We recommend rechecking your bra sizing every 6–12 months or after any significant body size changes.