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38DDD bras, also labelled 38F, in full coverage, minimizer and wireless styles at HauteFlair

38DDD Bras

(155 products)

38DDD is the same cup volume as 38F, with sister sizes 36G and 40DD. At a wider band, slipping straps are usually a sign the band is too loose rather than the straps being wrong.
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The HauteFlair Edit · Updated 2026

38DDD Bras: Also Labelled 38F in the US, 38E in the UK

38DDD is one size with three labels. US brands write it as 38DDD or 38F, and UK brands write the same cup as 38E. That mismatch is the most common reason a 38DDD shopper orders the wrong size from a full-bust brand.

Below: what 38DDD means, how the letters line up, the sister sizes worth trying, and why slipping straps at this band width are almost always a band problem.

Quick Answer

What is a 38DDD bra size?

38DDD is a US bra size with a 38 inch band and a cup roughly 6 inches larger than the underbust measurement. US brands label this same cup 38DDD or 38F, and in UK sizing it is 38E. The letters diverge because US cups run D, DD, DDD, DDDD, while UK cups run D, DD, E, F. Counting up from D, the third cup is DDD in the US and E in the UK. A UK 38F is one cup larger than a 38DDD. Its sister sizes are 36G and 40DD. At a wider band the common complaints shift: straps slipping off the shoulder and cups that separate rather than support, rather than a band riding up. Shop 38DDD bras at HauteFlair.

US 38DDD / 38FTwo US labels, one size
UK 38ESame cup, UK label
36G & 40DDSister sizes
38 in bandStrap fit matters most
Shop nearby sizes
38DDD36DDD40DDDDDD CupFull BustPlus Size BrasAll Bras

38DDD in other sizing systems

Most full-bust brands are UK-derived, so this is the conversion that matters when you order.

System Label Notes
US 38DDD, also written 38F US cups run D, DD, DDD, DDDD
UK 38E UK cups run D, DD, E, F. A UK 38F is one cup larger
EU 85E Band measured in centimetres
AU/NZ 16E Band numbering differs, cup matches UK

The trap: a 38DDD shopper who sees 38F on a UK brand such as Panache is looking at a cup one size too big. On those brands, look for 38E.

38DDD sister sizes

Move the band one step and the cup one step the other way, and the cup volume stays the same.

Size Relationship Try it when
36G Sister size down The 38 band feels loose or the straps keep slipping off your shoulders
38DDD Your size Band sits level, cups contain with no gap or spillover
40DD Sister size up The 38 band digs in at the underarm or across the back

Why this matters: slipping straps are usually a band problem, not a strap problem. Tightening straps on a loose band transfers weight to your shoulders instead of fixing it.

What works in a 38DDD

At this band, containment and shape matter more than lift alone.

Style Why it suits this size
Full coverage The most reliable fit at this band, with the least gapping at the top edge. See Full Coverage
Minimizer Redistributes rather than compresses, for a lower profile under shirts. See Minimizer Bras
Balconette Wide-set straps sit further in on the shoulder, which helps with slipping. See Balconette Bras
Side support Angled cup panels stop tissue escaping under the arm. See Side Support Bras
T-shirt and contour Smooth cups under fitted clothing, with real structure underneath. See T-Shirt Bras

Slipping straps almost never mean the straps are wrong. They mean the band is not holding, and the shoulders are taking the difference.

The HauteFlair Standard

38DDD FAQ

The questions shoppers in this size ask most.

What is a 38DDD bra size?

38DDD is a US bra size with a 38 inch band and a cup roughly 6 inches larger than the underbust measurement. US brands label this cup 38DDD or 38F, and in UK sizing it is 38E.

Is 38DDD the same as 38F?

In US sizing, yes. American brands use DDD and F for the same cup. In UK sizing they are different: a 38DDD is a UK 38E, and a UK 38F is one cup larger.

What is 38DDD in UK sizing?

38E. UK cups run D, DD, E, F, so the third cup above D is E, while US cups run D, DD, DDD. Most full-bust brands use UK sizing, so this is the label to look for.

What are the sister sizes for 38DDD?

36G and 40DD. Both hold the same cup volume as 38DDD on a tighter or looser band, so they are what to try when the cup fits but the band does not.

Why do my 38DDD bra straps keep slipping?

Usually because the band is too loose, so the straps are carrying weight the band should hold. Try the sister size 36G, or a balconette style where the straps sit further in on the shoulder.

How do I know if I am a 38DDD?

Measure snugly under the bust for the band, then around the fullest part for the bust. A difference of about 6 inches indicates a DDD cup. Fit matters more than the tape: the band should sit level on the loosest hook and the cup should contain with no gap or spillover.

Is 38DDD a plus size bra?

Band and cup are separate things. A 38 band sits at the lower end of plus-size band ranges, but a DDD cup is a full-bust cup at any band. Many 38DDD styles appear in both full-bust and plus-size ranges.

What bra styles work best in 38DDD?

Full coverage gives the most reliable fit at this band. Minimizers lower the profile under shirts without compressing, and balconette styles help when straps slip.

Sizing and fit guidance here is general and varies by brand; always check the size chart for the specific style you are buying, since US to UK conversions differ slightly between makers. Size availability reflects current stock. Last reviewed September 2026.

Shop 38DDD bras

Full coverage, minimizer, balconette, side support and t-shirt styles in 38DDD, also labelled 38F in the US and 38E in the UK.

Shop 38DDD36DDD40DDDPlus Size Bras

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