Size conversion
What Is a 28I in Other Brands?
Bra sizes are not standardized: the same label means different things brand to brand, so your 28I is a starting point, not a fixed size. A US 28I usually needs a 28J in Victoria’s Secret, maps to a 28G in a true-to-size UK brand like Panache, and stays a 28I in Wacoal.
Your 28I in Victoria's Secret
28J
Cups run a full cup small, so size up
Your 28I in Panache
28G
True-to-size UK sizing
Your 28I in Wacoal
28I
True to size, year after year
Every brand we track
Your 28I, brand by brand
Grouped by the sizing system each brand labels its cups in. Brands we stock link to their full lineup.
US
US-sized brands
| Brand | How it runs | Your 28I → |
|---|---|---|
| ThirdLovein stock | cups run generous | 28I |
| Wacoalin stock | true to size | 28I |
| Glamorisein stock | true to size | 28I |
| SHEFITin stock | - | Adjustable XS-6Luxe sizing rather than standard band/cup; size by the brand chart. |
| b.tempt'din stock | true to size | 28I |
| Kindred Bravelyin stock | - | Uses XS-XXL nursing/maternity sizing rather than band/cup; size by the brand chart. |
| ENELLin stock | - | Uses numeric high-impact sizing (00-8) rather than band/cup; size by the brand chart. |
| Natori | cups run small | 28I |
| Bali | band runs large | 26I |
| Playtex | band runs large | 26I |
| Maidenform | true to size | 28I |
| Vanity Fair | band runs large | 28I |
| Calvin Klein | band runs small | 28I |
| Victoria's Secret | cups run small | 28J |
| Brooks | band runs small | 28I |
| Under Armour | - | Compression fit runs generous; XS-XL sizing rather than band/cup; size by the brand chart. |
| Nike | - | Generous fit; XS-XL sizing rather than band/cup; size by the brand chart. |
| Cacique | band runs large | 28I |
| Torrid | band runs large | 28I |
UK
UK-sized brands (cups run D, DD, E, F, FF, G...)
EU
EU-sized brands
| Brand | How it runs | Your 28I → |
|---|---|---|
| Chantelle | cups run small | 28I |
| Simone Perele | cups run small | 28I |
| PrimaDonna | true to size | 28I |
| Marie Jo | true to size | 28I |
| Triumph | band runs large | 28I |
| Anita | true to size | 28I |
Translations are guidance from cross-brand fit data, not a guarantee - fit also depends on breast shape and style. Cross-brand offset data v1-2026-05-28.
In stock now
Shop 28I now
Real bras we track in stock in 28I, with live prices.
Freya
Offbeat Padded Half Cup Bra: Black
$66.00View →
Freya
Offbeat Plunge Bra: Rosehip
$66.00View →
Freya
Offbeat Side Support Bra: Rosehip
$68.00View →
Freya
Offbeat Molded Bra: Rosehip
$70.00View →
Freya
Starlight Side Support Balcony Bra: Caramel
$66.00View →
Freya
Starlight Side Support Balcony Bra: Black
$66.00View →
Freya
Starlight Molded Bra: Rosewater
$72.00View →
Freya
Starlight Molded Bra: Caramel
$72.00View →
28I sister sizes
Sister sizes hold the same cup volume on a different band. If the 28I cup fits but the band doesn’t, try:
Interactive
Try your own size
Not a 28I? Enter any size to see it in every brand. Your size never leaves your browser.
Brand Size Translator
Find your size across different brands
28I
Why sizes vary: Each brand uses different patterns, materials, and fit philosophies. A 34DD in Victoria's Secret fits differently than a 34DD in Panache.
ThirdLove
US
Half-cup sizing available; cups run slightly generous.
28I
Wacoal
US
True to size; consistent fit across decades.
28I
Panache
UK
UK sizing; true to size, consistent year over year.
28G
Freya
UK
UK sizing; bands run snug.
28G
Elomi
UK
UK plus-size full-bust; cups run generous.
28G
Glamorise
US
US full-figure; true to size.
28I
SHEFIT
US
Adjustable XS-6Luxe sizing rather than standard band/cup; size by the brand chart.
28I
b.tempt'd
US
Wacoal-family fit DNA; runs true to US sizing, lighter construction.
28I
Kindred Bravely
US
Uses XS-XXL nursing/maternity sizing rather than band/cup; size by the brand chart.
28I
ENELL
US
Uses numeric high-impact sizing (00-8) rather than band/cup; size by the brand chart.
28I
Natori
US
Cups run small; consider sizing up.
28I
Chantelle
EU
French sizing; cups run small.
28I
Bali
US
Bands run loose; consider sizing down.
26I
Playtex
US
Bands run large; size down in band.
26I
Maidenform
US
Generally true to size.
28I
Vanity Fair
US
Bands run slightly loose.
28I
Calvin Klein
US
Bands run slightly snug.
28I
Victoria's Secret
US
Cups run very small; size up a full cup.
28J
Fantasie
UK
UK sizing; consistent fit.
28G
Curvy Kate
UK
UK sizing; bands run firm.
28G
Gossard
UK
UK sizing; classic fit.
28G
Pour Moi
UK
UK sizing; budget-friendly.
28G
Simone Perele
EU
French luxury; cups run small.
28I
PrimaDonna
EU
Belgian luxury; true EU sizing.
28I
Marie Jo
EU
Belgian; consistent fit.
28I
Triumph
EU
German; bands slightly generous.
28I
Anita
EU
German; strong post-surgery range.
28I
Brooks
US
Compression sports style; may run snug.
28I
Under Armour
US
Compression fit runs generous; XS-XL sizing rather than band/cup; size by the brand chart.
28I
Nike
US
Generous fit; XS-XL sizing rather than band/cup; size by the brand chart.
28I
Goddess
UK
UK sizing; strong plus-size range.
28G
Cacique
US
Lane Bryant's brand; bands run generous.
28I
Torrid
US
Plus-focused; bands run large.
28I
Common questions
28I conversion questions
- What is a 28I in Victoria's Secret?
- Victoria's Secret cups run about a full cup small, so a standard US 28I usually needs a 28J there. If you already wear a 28I in Victoria's Secret, your size in a true-to-size brand is likely a cup smaller.
- Which brands keep a 28I the same?
- In true-to-size brands a US 28I stays a 28I: Wacoal, Panache, Glamorise, b.tempt'd, Maidenform, Fantasie, Gossard, Pour Moi, PrimaDonna, Marie Jo, Anita, Goddess. Fit can still vary by style, so treat the label as the starting point.
- Do UK brands size a 28I differently from US brands?
- UK brands label cups in a different sequence above D (D, DD, E, F, FF, G), so the same letters can mean different volumes. In a true-to-size UK brand like Panache, a US 28I is a 28G; the band number stays the same.
- What size replaces a 28I in brands that don't use cup sizes?
- SHEFIT, Kindred Bravely, ENELL, Under Armour, Nike size by their own charts (XS-XL or numeric) instead of band/cup, so a 28I doesn't carry over directly. Start from each brand's chart with your underbust and bust measurements.