20B
20B Bra Size – Find Your Perfect Fit at The Foundation
What Is a 20B Bra Size?
A 20B bra size offers a perfect fit for those with a fuller band and a moderate cup. In Australian bras (based on Australian Standard Sizing), the number (20) represents your band size—the measurement around your ribcage just under your bust.
The letter (B) reflects your cup size, indicating the volume of your bust. If you’ve got a curvier body shape with a smaller bust, this size is likely most like your own.
At The Foundation, we stock Australian bras tailored to unique needs, including 20B Curve Plus Size Bras—because every body deserves comfort and confidence.
International Size Conversion for 20B
| Country | Equivalent to 20B (AU) |
|---|---|
| UK | 42B |
| US | 42B |
| EU | 95B |
| France (FR) | 110B |
Bra sizes vary globally, so always refer to this international size conversion chart for 20B before purchasing to ensure the perfect fit.
How to Measure Using a Tape Measure
-
Step 1: Measure Your Band Size
Wrap a soft tape measure around your ribcage, directly under your bust. Round to the nearest whole number. Around 95cm = band size 20. -
Step 2: Measure Your Bust
Wrap the tape around the fullest part of your bust. The difference between bust and band gives you your cup size.
Example:
- Underbust: 95cm
- Bust: 97.5cm
- Difference: 2.5cm = B cup → Result: 20B
Still unsure? Use our size calculator or get tailored advice via our video fitting service.
Explore Sister Sizes for More Flexibility
Sister sizes allow flexibility when shopping. For 20B, try:
- 18C (tighter band, larger cup)
- 22A (looser band, smaller cup)
This opens up a wider selection of styles and ensures you find your perfect bra.
Best Bra Styles for a 20B Fit
- Wire-Free Bra: Great for everyday comfort and breathability.
- T-Shirt Bra: Ideal for seamless looks under clothing.
- Contour Bras: Offer support and shaping with a smooth silhouette.
- Full Cup Control Bra: For those who want structured support.
- Balconette T-Shirt Bra: Adds lift with a rounded shape.
- Soft Cup and Posture Bra: Comfort-focused styles for sensitive skin or posture support.
- Push Up Bra: Adds volume and lift when desired.
- Strappy Bralettes: Stylish and comfortable for casual wear.
- Strapless Bra: Perfect for off-shoulder looks.
Premium Brands Stocked in 20B
We partner with top international and Australian brands offering sizes up to 24DD in select styles:
- PrimaDonna – Sophisticated style and support.
- Susa – Known for breathable materials and soft finishes.
- Triumph – Everyday staples like the Ultimate Lift & Support.
- Chantelle – Fashion bras with French flair.
- Anita – Reliable, full cup coverage.
- Royce – Specialist in supportive wirefree bras.
Why Shop at The Foundation?
Our 20B Curve range features bras for real bodies, in sizes that feel like they were made for you. Whether it’s an everyday piece or a fashion bra for a night out, we make sure your bra fits as well as it flatters. Unlike mass-market retailers, our curated 20B selection brings together high-quality, style-forward options specifically chosen to suit fuller bands with smaller busts.
- Standard Shipping Australia-Wide
- Buy Now, Pay Later available
- Easy Returns Policy for peace of mind
- Size filters and selection results designed for smooth user experience—no full page refresh
Shop Now and experience the support you deserve.
FAQs
What does a 20B size mean in Australian bras?
20 refers to your underbust measurement (band size), and B is your cup size (bust volume). Perfect for fuller torsos with smaller busts.
Which bra styles are best for 20B?
Seamless t-shirt bras, full cup bras, and wireless options are ideal. For a touch of elegance, consider styles like the Vamp Midnight Masquerade Bra—available in select sizes and perfect for occasions where sophistication meets support.
Is 20B part of a plus size or curve range?
Yes. It fits within the curve and plus size group, typically size 16-22 B-H.
Can I get personalised fitting advice?
Absolutely. We offer in-store fittings, virtual phone support, and expert advice from our Customer Service team. Find your nearest location here.
Where is The Foundation located?
Visit us in-store at one of our locations across Australia, including our North Adelaide boutique (PO Box 437, NORTH ADELAIDE SA 5006), or explore our full collection online.
Confidence begins with a bra that fits. The Foundation is here to help you find yours.