18JJ
18JJ Bra Size Collection
Understanding the 18JJ Bra Size
The 18JJ bra size is part of the extended cup size spectrum. It’s designed to deliver comfort, structure, and support for fuller busts. In this size, the band size (18) refers to the body underbust measurement, typically fitting an underbust of around 98–102 cm. The JJ cup denotes a very full bust—approximately 134–136 cm across the fullest part of the chest. This size is crucial for ensuring balance between band support and cup volume, helping you feel held without compression. These bras are ideal for the fullest figures, offering firmer support where it counts most.
International Bra Size Conversion
| Region | Size Equivalent |
|---|---|
| UK (AU Standard) | 18JJ |
| US | 40N |
| EU | 90O |
| FR | 105O |
Note: Cup sizing varies between countries, so always double-check your measurements when shopping international styles. For personalised help, try our Bra Finder tool to find your perfect match in seconds.
How to Measure Your Bra Size
All you need is a soft tape measure and a mirror (or a friend). Here's a quick fitting guide:
- Step 1: Measure your band size – Wrap the tape around your ribcage, just under your bust. Keep it snug and level. Round to the nearest even number. This is your band size.
- Step 2: Measure your bust size – Measure around the fullest part of your bust. Keep the tape straight but not tight.
- Step 3: Calculate cup size – Subtract your band size from your bust measurement. Each 2.5cm difference = 1 cup size. (E.g., 18 band and a 136 cm bust = JJ cup)
Sister Sizes and Alternatives
If your favourite bra is out of stock or you’re in between sizes, here are some nearby sister sizes:
Always try on your bras to feel what fits best. Even sister sizes can feel different based on style and brand.
Best Bra Styles for Size 18JJ
For larger cup sizes like 18JJ, structure matters. The following styles offer the right blend of support and comfort:
- Underwired bras – For lift and separation
- Full-cup bras – For complete coverage and control
- Lightly padded bras – Shape enhancement without bulk
- Wireless bras – Great for gentle support on rest days
- Seamless bras – Invisible under clothes, perfect for t-shirts
- Strapless bras – For versatile outfit styling
- Sports bras – For active support from low to high impact activities
- Nursing bras – For postpartum support and comfort
Whether you prefer low impact or high impact activities, our sports bras deliver the confidence and stability you need.
Brands We Trust in 18JJ
We proudly stock bras from trusted lingerie brands like Elomi, including the popular Elomi Cate Underwire Full Cup Bra. These pieces are engineered with firmer support and superior design to support fuller busts with elegance. Also explore the Goddess Keira Wired Bra for enhanced comfort. Want more from Elomi? Explore our full Elomi collection in 18JJ for expert support and everyday style that’s made to fit.
Your Perfect Fit, Just a Click Away
Feeling good in your bra starts with the right size and style. Our Size Chart, in-store and virtual bra fitting services are here to help. Whether you're booking an expert bra-fitting service in-store or prefer our virtual bra fitting service from home, we're here to guide you every step of the way.
Shop Now and discover why our customers love our curated range of fuller bust lingerie.
FAQs
1. How do I know if 18JJ is the right bra size for me?
Measure your underbust and bust using our guide above, or visit our store for a professional bra fitting.
2. Are Elomi bras good for large cup sizes?
Yes! Elomi is known for creating supportive, stylish bras for fuller figures, including 18JJ.
3. Can I return a bra if it doesn’t fit?
We offer 100 Day Returns on eligible full-priced items. See our Orders & Returns page for details.
4. What if I’m between sizes?
Consider trying a sister size, or reach out for personal fit advice through our Bra Finder tool.
5. What’s the best bra style for everyday wear in size 18JJ?
Try seamless or full-cup styles for day-long comfort and invisible support. Our sports bras are great for higher activity levels.