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38JJ Bras

(9 products)

How a 38JJ should fit

A 38JJ is a full-bust size, and the engineering matters more than the label. Wide side wings, a firm band with four hooks and seamed cups will outperform a prettier bra with thin straps every time.

Sister sizes to try

Band loose, cup fine — try 36K
Cup overflowing — try 38K
Band digs in — try 40J

In a 38JJ, the 38 refers to your ribcage measurement and the JJ to a bust roughly 14 inches larger than it. If you've been fitted in a US brand and are shopping a European label, expect the letter to shift — the volume stays the same, the notation doesn't.

How a 38JJ should fit

At JJ cup, weight distribution is the whole problem. A 38JJ needs a taut band, a centre gore that sits flush against the sternum, and cups built in three or four panels — a single moulded cup simply cannot hold this volume in shape.

Sister sizes to try if 38JJ isn't right

Band feels loose but the cup is right — try 36K
Band is comfortable but you're spilling over — go up to 38K
Band digs in — 40J gives the same cup volume with more room

Best 38JJ styles

Look for side support panels, which push tissue forward and stop it migrating under the arm — the single most useful feature at 38JJ. Full cup and balconette shapes both work; strapless is harder at this size and worth trying with a longline style, which spreads the weight across a wider band.