12JJ Bra Size – Fit, Support & Confidence
Understanding Your 12JJ Bra Size
The 12JJ bra size is made for women who need a firm underband with generous cup volume. The number "12" refers to the band size, which suits a size 12 (AU) body — typically a ribcage measurement of around 76 cm. The "JJ" represents the cup size, which is significantly fuller than a standard D cup, offering critical support and coverage for curvy women and larger busts without compromising comfort or shape.
International Size Conversion
| Region | Size Equivalent |
|---|---|
| UK | 34JJ |
| US | 34N |
| EU | 75N |
| FR | 90N |
How to Measure Your Bra Size
Finding your perfect fit starts with accurate measurements. Here’s a quick guide:
- Band Size: Measure around your ribcage, just under your bust. Round to the nearest whole number — this is your band size.
- Bust Measurement: Measure around the fullest part of your bust, keeping the tape flat and even.
- Cup Size: Subtract your band size from your bust measurement. The difference determines your cup size.
Need help? Visit our Size Chart or Bra Sizing Guide.
Sister Sizes and Alternatives
If 12JJ isn’t quite right, consider trying its sister sizes, which offer the same cup volume with a different band size:
Sister sizes can be a great solution if you're in between sizes or looking for a different level of band support. Some sports bras include multi-way straps or crossover options for extra adjustability and comfort.
Best Styles for 12JJ
Bras designed for fuller busts are built differently — and they make all the difference. Our top picks for 12JJ include:
- Lightly padded bras: Add shape without bulk.
- Wireless bras: Ideal for comfort and structure, perfect as wirefree sports bras or for everyday wear.
- Seamless bras: A go-to for smooth silhouettes under clothing.
- Full-cup bras: Designed for natural breasts needing full coverage.
- Supportive sports bras: Featuring compression design and bust separation, ideal for high-impact activities like netball, basketball, AFL, cricket, and gym.
From non-padded sports bras for yoga to plus-size sports bras with breathable mesh for dance, athletics, golf, or soccer — we've got you coverezd.
Brands That Stock 12JJ
We proudly stock Elomi in 12JJ — a standout brand known for its innovation in fuller bust lingerie. Elomi bras feature breathable and moisture-wicking fabrics, adjustable and wider straps, and even J-hook options for versatile styling. Crafted with stiffer fabric and strategic engineering, these bras offer ultimate comfort and support — even for high-quality J cup sports bras.
Your Perfect Fit Awaits
Ready to feel supported, stylish and confident? Our curated collection of bra sizes caters specifically to fuller bust lingerie needs. Whether you're browsing Sports Bras Australia or shopping for everyday comfort, you'll find pieces tailored to your body and lifestyle.
FAQs
What is a 12JJ bra size?
"12" is your band size (Australian standard), and "JJ" represents a very full cup size. Together, they describe a bra made for smaller ribcages with generous bust volume.
How do I know if I’m wearing the right bra size?
If your straps dig in, your band rides up, or your cups gape or overflow — it’s time for a re-fit. Use a tape measure or visit one of our stores for personalised customer service and an expert bra-fitting service.
Is 12JJ a common bra size?
It’s less common — but that’s exactly why we stock it. We believe every body size deserves beautifully made, supportive lingerie and plus-size sports bras that truly fit.
What if my size is out of stock?
We restock regularly. You can also explore sister sizes like 10K or 14J, or look for styles with strap adjusters for more flexibility and comfort.
Can I return a bra if it doesn’t fit?
Yes — as long as it’s unworn and unwashed. Visit our Returns & Exchanges page for full details. Our returns service and excellent customer reviews are here to help you shop with confidence.