The Best Bras for 40B

Cup letters diverge above D, so the letter changes even though the bra does not. Convert by position, and match the printed tag in the table below.

Of the 40: 22 carry 40B well inside their chart, 18 at its edge. Well in range means the size sits inside the brand's chart, cut from a block graded around it. At chart edge means it is the first or last size they make, which is real but drafted at the limit of their grading. Your measured size guide: the universal 40B page.

40B pairs a larger band with modest cup depth, a proportion the industry underserves in the opposite direction from full-bust sizes: bands go up but the assumed cup depth climbs with them, leaving shallow-cup wearers with cups that wrinkle at the top.

Look for stretch-top cups, lightly lined or unlined styles, and wireless constructions with structured bands. At this proportion the band delivers the support and the cup mostly needs to follow the profile without excess fabric.

Brands whose plus-band ranges start rather than end at your band tend to grade the shallow letters more honestly there.

Watch for: Wrinkling at the top of the cup here usually means the profile, not the letter. Try a stretch-edge cup before sizing the letter down and losing base volume.

A sister size keeps identical cup volume on a different band. If the 40B band rides up or digs in while the cup fits, the sister is the fix.

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