20D
20D Bra Size – Find Your Perfect Fit
What Is a Size 20D Bra? Understanding Cup and Band Sizes
A 20D bra size means the band (the part that wraps around your back) measures 20 inches, and the D cup shows a fuller bust size—so it’s ideal for a smaller back with a larger chest. This size is perfect for those with a larger bust and a smaller back. In Australian sizing, the band (or back size) is measured under the bust, while the D cup reflects the difference between your bust and underbust measurements. The cup volume of a 20D offers full support for fuller busts while maintaining a firm fit around the torso. This size is commonly recommended for those needing a secure yet comfortable everyday option.
International Bra Size Conversion Table
Finding your match across global sizing systems? Use our international bra size chart below to find your 20D equivalent:
| Region | Band Size + Cup | Equivalent Size |
|---|---|---|
| AU/NZ | 20D | 20D |
| UK | 42D | 42D |
| US | 42D | 42D |
| EU | 95D | 95D |
| FR | 110D | 110D |
Need more help? Visit our International Bra Size Conversion Chart.
How to Measure Your Bra Size with a Tape Measure
To find your best fit, follow our quick size calculator method:
- Measure your band size (back size): Wrap a tape measure snugly under your bust. Round to the nearest even number.
- Measure your bust size: Place the tape measure over the fullest part of your bust.
- Find your cup letter: Subtract the band measurement from your bust. A 4-inch difference = D cup.
Visit our Bra Fit Guide, book a fitting appointment, or try our virtual bra fitting service—where our expert team will guide you through measurements and product selection via video or phone, all from the comfort of your home.
Find Sister Sizes and Fit Alternatives for Size 20D
If you’re not quite getting the perfect fit with 20D, consider these sister sizes:
These options help when band or bust measurement is between sizes. You can also use our online bra fitting for extra support.
Which Bra Styles Work Best for 20D?
For comfort, shape and support, our D-K cup bra-fitters recommend these styles for everyday wear:
- T-shirt bras – smooth, seamless cups for natural shape bras
- Lightly padded bras – enhanced shape bras with gentle definition
- Wireless bras – flexible stretchy support without wires
- Full cup or balcony bras – great for fuller bodies
- Sports bras or maternity bras – extra hold for active or nursing needs
- Strapless bras or push-up bras – for fashion-forward flexibility
We also carry specialty lines like the B Free Wire Free Bra Collection, made with seamless circular machinery for breathable materials and superior comfort.
Shop Women’s Bras in 20D from Trusted Lingerie Brands
At The Foundation, we stock plus-size bra and fuller bust lingerie options from top lingerie brands in Australia and internationally:
New arrivals are updated every fortnight to keep your wardrobe fresh and on-trend.
Find Your Best Fit – Shop 20D Bras Online Today
Ready to feel confident in your lingerie?
Browse our collection of 20D daily-wear bras, plus-size underwear, and D cup bras—all curated for superior support, comfort, and style. Enjoy tracked service, shipping Australia-wide, and free exchanges with expert customer service from our Sydney warehouse.
Want early access to exclusive offers? Sign up for SMS messages or explore our best sellers and Shop Sale picks!
FAQs About 20D Bra Sizing and Fit
What makes 20D different from other sizes?
It offers a specific combo of small band and fuller cup volume. Perfect for fuller busts and petite frames.
How do I know if 20D will fit me well?
Use our size chart or book a Bra Fitting. Our expert team offers virtual fittings and in-store fittings to help you.
What are my options if I’m between sizes?
Try sister sizes like 18DD or 22C. Use our Bra Fit Guide to find the best fit.
Can I return a bra if it’s not the right fit?
Yes! We offer free exchanges and have a clear Returns Policy.
How does Australian sizing compare to US size or EU size?
Refer to our Conversion Table above for a side-by-side comparison of global bra size systems.
Your perfect fit starts here—powered by over 15 years of experience in the Australian lingerie industry and customer reviews that speak for themselves.