J Cup Bras

J cup is the largest size we stock — and one that's genuinely rare on the high street, where most "plus size" ranges quietly cap out well below it. Every J cup style here is drafted from the ground up for this proportion, across full cup, underwired, non-wired, front-fastening and mastectomy styles.

Sizing note

A J cup means roughly an 11-inch difference between your bust and underbust measurement. Because J cup is so rarely stocked properly, it's especially worth confirming your size rather than assuming — our bra fitting guide covers band and cup measurement in full.

Frequently asked questions

Do you really stock a full range in J cup?

Yes — sports, everyday, front-fastening and post-surgery styles are all available up to J cup, not just a token size at the top of the chart. If you're specifically at 42J, 44J or 46J, see our guide to extended sizes 42J-46J.

What if J cup still doesn't feel quite right?

Band size makes a bigger difference than most people expect at this cup size — our H cup range is worth checking too, since cup volume overlaps between neighbouring letters at different bands.

If you run or train at J cup, our guide to running bras for J cup women covers what actually works. Free UK delivery. 30-day no-quibble returns.