Size conversion
What Is a 50I in Other Brands?
Bra sizes are not standardized: the same label means different things brand to brand, so your 50I is a starting point, not a fixed size. A US 50I usually needs a 50J in Victoria’s Secret, maps to a 50G in a true-to-size UK brand like Panache, and stays a 50I in Wacoal.
Your 50I in Victoria's Secret
50J
Cups run a full cup small, so size up
Your 50I in Panache
50G
True-to-size UK sizing
Your 50I in Wacoal
50I
True to size, year after year
Every brand we track
Your 50I, 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 50I → |
|---|---|---|
| ThirdLovein stock | cups run generous | 50I |
| Wacoalin stock | true to size | 50I |
| Glamorisein stock | true to size | 50I |
| SHEFITin stock | - | Adjustable XS-6Luxe sizing rather than standard band/cup; size by the brand chart. |
| b.tempt'din stock | true to size | 50I |
| 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 | 50I |
| Bali | band runs large | 48I |
| Playtex | band runs large | 48I |
| Maidenform | true to size | 50I |
| Vanity Fair | band runs large | 50I |
| Calvin Klein | band runs small | 50I |
| Victoria's Secret | cups run small | 50J |
| Brooks | band runs small | 50I |
| 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 | 50I |
| Torrid | band runs large | 50I |
UK
UK-sized brands (cups run D, DD, E, F, FF, G...)
| Brand | How it runs | Your 50I → |
|---|---|---|
| Panachein stock | true to size | 50G |
| Bravissimoin stock | true to size | 50G |
| Freyain stock | band runs small | 50G |
| Elomiin stock | cups run generous | 50G |
| Fantasiein stock | true to size | 50G |
| Curvy Kate | band runs small | 50G |
| Gossard | true to size | 50G |
| Pour Moi | true to size | 50G |
| Goddess | true to size | 50G |
EU
EU-sized brands
| Brand | How it runs | Your 50I → |
|---|---|---|
| Chantelle | cups run small | 50I |
| Simone Perele | cups run small | 50I |
| PrimaDonna | true to size | 50I |
| Marie Jo | true to size | 50I |
| Triumph | band runs large | 50I |
| Anita | true to size | 50I |
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 50I now
Real bras we track in stock in 50I, with live prices.
Glamorise
Lace Comfort WonderWire Bra Black
$60.00View →
Glamorise
MagicLift Front-Closure Natural Shape Bra White
$59.00View →
Glamorise
MagicLift Front-Closure Natural Shape Bra Black
$59.00View →
Glamorise
Lace Comfort WonderWire Bra Jade
$60.00View →
Glamorise
MagicLift Front-Closure Posture Back Bra Blue
$43.40View →
Glamorise
MagicLift Front-Closure Posture Back Bra White
$43.40View →
Glamorise
MagicLift Front-Closure Posture Back Bra Cafe
$43.40View →
Glamorise
MagicLift Front-Closure Posture Back Bra Black
$43.40View →
50I sister sizes
Sister sizes hold the same cup volume on a different band. If the 50I cup fits but the band doesn’t, try:
Interactive
Try your own size
Not a 50I? Enter any size to see it in every brand. Your size never leaves your browser.
Brand Size Translator
Find your size across different brands
50I
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.
50I
Wacoal
US
True to size; consistent fit across decades.
50I
Panache
UK
UK sizing; true to size, consistent year over year.
50G
Bravissimo
UK
UK sizing, and its US site labels cups the UK way too (FF, GG, HH). Fit offsets not yet measured.
50G
Freya
UK
UK sizing; bands run snug.
50G
Elomi
UK
UK plus-size full-bust; cups run generous.
50G
Glamorise
US
US full-figure; true to size.
50I
SHEFIT
US
Adjustable XS-6Luxe sizing rather than standard band/cup; size by the brand chart.
50I
b.tempt'd
US
Wacoal-family fit DNA; runs true to US sizing, lighter construction.
50I
Kindred Bravely
US
Uses XS-XXL nursing/maternity sizing rather than band/cup; size by the brand chart.
50I
ENELL
US
Uses numeric high-impact sizing (00-8) rather than band/cup; size by the brand chart.
50I
Natori
US
Cups run small; consider sizing up.
50I
Chantelle
EU
French sizing; cups run small.
50I
Bali
US
Bands run loose; consider sizing down.
48I
Playtex
US
Bands run large; size down in band.
48I
Maidenform
US
Generally true to size.
50I
Vanity Fair
US
Bands run slightly loose.
50I
Calvin Klein
US
Bands run slightly snug.
50I
Victoria's Secret
US
Cups run very small; size up a full cup.
50J
Fantasie
UK
UK sizing; consistent fit.
50G
Curvy Kate
UK
UK sizing; bands run firm.
50G
Gossard
UK
UK sizing; classic fit.
50G
Pour Moi
UK
UK sizing; budget-friendly.
50G
Simone Perele
EU
French luxury; cups run small.
50I
PrimaDonna
EU
Belgian luxury; true EU sizing.
50I
Marie Jo
EU
Belgian; consistent fit.
50I
Triumph
EU
German; bands slightly generous.
50I
Anita
EU
German; strong post-surgery range.
50I
Brooks
US
Compression sports style; may run snug.
50I
Under Armour
US
Compression fit runs generous; XS-XL sizing rather than band/cup; size by the brand chart.
50I
Nike
US
Generous fit; XS-XL sizing rather than band/cup; size by the brand chart.
50I
Goddess
UK
UK sizing; strong plus-size range.
50G
Cacique
US
Lane Bryant's brand; bands run generous.
50I
Torrid
US
Plus-focused; bands run large.
50I
Common questions
50I conversion questions
- What is a 50I in Victoria's Secret?
- Victoria's Secret cups run about a full cup small, so a standard US 50I usually needs a 50J there. If you already wear a 50I in Victoria's Secret, your size in a true-to-size brand is likely a cup smaller.
- Which brands keep a 50I the same?
- In true-to-size brands a US 50I stays a 50I: Wacoal, Panache, Bravissimo, 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 50I 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 50I is a 50G; the band number stays the same.
- What size replaces a 50I 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 50I doesn't carry over directly. Start from each brand's chart with your underbust and bust measurements.