A tape measure and two numbers before you find a wireless bra
Short answer: With a tape measure you need two numbers: the circumference just under the bust and the circumference at the fullest point. The numbers are used with the size guide to find a wireless bra for a large bust where both band and cup fit.
Why two numbers are enough to start
The first number is the circumference of the ribcage under the bust, and the second is the circumference at the fullest point. The difference between the two says something about the cup size. When you look for a wireless bra for a large bust, though, it is the guide for the individual bra that decides which size to choose.
How to measure under the bust
Stand in front of a mirror wearing a bra or a close-fitting top, and place the tape level around the ribcage just under the bust. Pull it snug without squeezing and breathe out calmly. Write the number down. Measure twice to be sure, and check in the mirror that the tape does not tilt. See bamboo bra without underwire for sizes.
How to measure over the bust
Place the tape around the fullest point of the bust and across the back, without pressing. Keep it level and write the number down. If you are unsure, measure again in another position. That gives a reliable second number to use when you compare with the size guide.
Choose by the guide, not by habit
Sizes vary from brand to brand, so always use the guide for the bra you are considering. Compare your two numbers with the chart and choose the size that is closest. A wireless bra for a large bust must sit firmly, so do not choose a band that is too loose for comfort.
When the numbers fall between two sizes
If your numbers fall between two sizes, try both if you can. Choose the one where the band sits flat and the cups enclose without bulging. A slightly snug bra often gives a little, while one that is too big cannot be made tighter. Also read how JBS states its measurements.
Check the fit after measuring
Measuring is a starting point, not a verdict. Put the bra on and check that the band is level, the straps do not dig in and the cups enclose the bust. Lift your arms and see whether anything moves. If it does, try another size.
Measure again after a while
The body changes over time, and bras give. Measure again once a year or after bigger changes. That way you keep your size up to date and avoid buying by an old measurement. You can also take a bra that fits and compare.
Once the bra is bought
Care keeps the fit. Wash gently in a net and avoid the dryer. Combine with a women's long-sleeved bamboo T-shirt if you want one more layer. Save your numbers so they are ready next time.
Frequently asked questions
Which two numbers do I need?
The circumference under the bust and the circumference at the fullest point. Compare with the size guide for the individual bra.
Can I measure myself?
Yes, with a soft tape measure in front of a mirror. Measure twice and keep the tape level without squeezing.
Is the size the same across all brands?
No, it can vary. Always check the guide for the bra you want to buy and try it in motion.
