20DD
Shop 20DD Bra Sizes – Find Your Perfect Fit
Understanding the 20DD Bra Size for Your Body Shape
A 20DD bra size combines a band size of 20 (AU) with a DD cup, making it ideal for those with a fuller bust and broader underbust measurement. In Australian sizing, the band size reflects your underbust measurement, while the cup size reflects the volume of your bust.
Cup depth matters – a DD cup typically means there's about a 7-inch difference between the bust and underbust. This size sits in the plus-size bra category and provides full coverage and shape.
Bra Size Chart & International Conversions
Use this handy bra size converter to find your perfect international match:
| Region | Size Equivalent |
|---|---|
| Australia (AU) | 20DD |
| UK | 42DD |
| US | 42DD or 42DDD |
| EU | 95E |
| France (FR) | 110E |
Tip: Explore our full Bra Size Chart for other sizes, including size 8–12 A–D, size 14 B–D, and size 16–22 B–H.
How to Measure Bra Size Using a Tape Measure
Finding your exact size starts with these simple steps:
1. Measure Your Band Size
- Use a tape measure around your ribcage, just under your bust.
- Keep it snug and level. Round to the nearest even number (e.g. 20).
2. Measure Your Bust
- Measure around the fullest part of your bust without squeezing.
3. Calculate the Difference
- Bust – Band = Cup Size. A 7-inch difference = DD.
Need help? Our virtual bra fitting service and Bra Fit Guide provide personalised bra recommendations with support from expert D–K cup bra-fitters.
Sister Sizes & Alternatives to Size 20DD
Can’t find size 20DD? Consider these sister sizes:
These options are great if you’re between sizes or looking for more flexibility.
Best Bra Styles for a Fuller Bust
Our range of fuller bust lingerie includes:
- Full cup bras – Maximum coverage and support
- Lightly padded bras – Natural shape with structure
- Wireless bras – All-day comfort without wires
- Smoothing contour bras – Seamless under clothing
- Strapless bras – Secure support without straps
- Nursing bras – Comfort and functionality for new mums
- Maternity bras – Gentle support throughout pregnancy
- Plus-size wirefree bras – Flexible, supportive designs
Featured Brands Available in Size 20DD
We proudly stock leading lingerie brands known for supporting curvy bras in extended sizes:
- Triumph – Classic comfort and reliable support
- Elomi – Trend-forward designs for curvier bodies
- Berlei – Ideal for everyday and active support
- Fantasie – Feminine styles with integrated shaping
These brands offer a variety of options across sports bras, natural shape bras, and coordinated sets.
Why Shop at The Foundation?
We're not Bras N Things — we're better. Here’s why:
- Virtual fittings with expert advice
- Easy returns policy and free returns
- Tracked shipping Australia-wide and internationally
- Eco-friendly packaging from our Sydney warehouse
- Buy Now, Pay Later options available
- Best Sellers, new arrivals, exclusive offers always in stock
Get Your Perfect Fit – Shop Size 20DD Now
Our curated collection of size 20DD bras brings together style, structure, and comfort. Whether you're shopping for a maternity bra, strapless bra, or an everyday staple, we’ve got you covered.
Shop our 20DD bras now and enjoy a seamless user experience, fit-tested by our community of happy customers.
FAQs
How do I know if 20DD is the right size for me?
Measure your band and bust, then use our Bra Fit Guide or speak with our fitting experts for advice.
What if the bra doesn’t fit?
Our returns policy allows for easy exchanges and returns.
Are your bras machine washable?
Yes, but we recommend using a lingerie wash bag on a gentle cycle.
Do you offer matching sets?
Yes – many bras come with coordinated sets.
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