Enter your size once.
Decode it everywhere.
Victoria’s Secret, Skims, Savage X Fenty, Aerie, Cuup, ThirdLove, Freya, Chantelle, Wacoal, Panache — and 60+ more. Bra sizing in 2026 is not standardized. It’s fragmented by brand, region, fabric, cup depth, and band tension. Your “34DD” is not wrong — it’s simply interpreted differently by every brand.
Global Brand Intelligence • 60+ Brands • 2026
Brand Size Decoder
Enter your true size, pick a brand — get the exact size to try, fit warnings, and sister sizes. Real data from 60+ brands worldwide.
What is the Brand Size Decoder?
US Brands
Victoria’s Secret, ThirdLove, Honeylove, Parade — U.S. and hybrid sizing.
UK Brands
Freya, Panache, Curvy Kate, Bravissimo — DD/E/F/FF cup progression.
Global + EU
EU/FR, Japan, AU/NZ, luxury, plus-size, sports, maternity systems.
Brand Size Conversion Guide
Bra sizes measure relative volume — not fixed letters
A 34DD in one brand does not equal 34DD everywhere else. Bra sizes are not standardized across brands. Some follow U.S. sizing, others use U.K. progression, and many use hybrid systems combining different cup steps with unique fabric stretch.
Band tightness, cup depth, padding, wire width, and fabric recovery all change how a size fits. Your 34DD can translate to 34DDD/F or 34G at Victoria’s Secret, 34D–34DD at Aerie, 34E at Savage X Fenty, 34E at Cuup, and 36D at Skims.
Your size is a range, not a single label
If you wear 34DD (US), your sister sizes hold the same breast volume with a different band feel. The Decoder uses this logic to adapt your size across every brand’s unique personality.
How major bra brands translate a 34DD (US)
Each brand below is profiled by sizing system, band feel, cup depth, and the recommended starting size for a US 34DD wearer.
Victoria’s Secret uses D → DD → DDD/F → G → H. The extra DDD step and firm band construction make your familiar size look like a larger letter. Padded styles add even more volume to the cup architecture.
Aerie bras have softer bands and shallower cups — especially bralettes. Many 34DD wearers find 34D fits in stretch styles, while 34DD works in molded or supportive underwire designs.
Savage X uses UK-style cup progression with smaller, more precise steps. Their cups run deeper and their bands are genuinely supportive — a rarity for a mass-market brand.
Cuup labels volume truthfully with minimal padding and clean lines. Their cup designation reflects real volume — which is why many 34DD (US) wearers feel best in 34E at Cuup.
Skims prioritize sleekness under clothing — bands are intentionally tight and cup fabrics are very stretchy. Most 34DD wearers go up one band size for everyday comfort.
ThirdLove is famous for half cups — solving the “between sizes” problem. Many 34DD wearers start around 34E or a half-cup up if they get quad-boob in other brands.
Honeylove bras are designed to hold, smooth, and structure simultaneously. Most 34DD wearers find 34F more comfortable, with 36E as the alternative when band pressure is a concern.
Negative Underwear runs true in band and minimal in cups. Most wearers can stay close to their usual U.S. size — 34DD in Sieve styles, 36D in less stretchy minimal designs.
Parade uses S–XXL sizing for most bralettes. Your 34DD becomes a size range — L for super-stretchy bralettes, XL for more supportive or double-layer styles.
Want your perfect bra size across all brands?
Stop guessing at Victoria’s Secret, Aerie, Savage X Fenty, Skims, and more. Use the free Bra Size Calculator first, then decode your size by brand.
Bra Size Conversion Chart: 34DD (US) Across Major Brands
This pattern-based conversion chart applies brand fit data, elasticity patterns, professional fitter observations, and community data — not just static charts.
| Brand | System | Band Feel | Cup Depth | Starting Size for 34DD (US) | Confidence |
|---|---|---|---|---|---|
| Victoria’s Secret | US Hybrid | Firm | Generous | 34DDD/F | ⭐⭐⭐⭐ 82% |
| Aerie | US Standard | Stretchy | Shallow | 34D–34DD | ⭐⭐⭐⭐ 79% |
| Savage X Fenty | UK-Leaning | Supportive | Deep | 34E | ⭐⭐⭐⭐⭐ 90% |
| Cuup | True-Volume | Accurate | Honest | 34E | ⭐⭐⭐⭐⭐ 93% |
| Skims | Compression | Very Tight | Stretchy | 36D | ⭐⭐⭐⭐ 88% |
| ThirdLove | US + Half Cups | Firm | Deep | 34E | ⭐⭐⭐⭐⭐ 91% |
| Honeylove | Structured | Tight | Firm | 34F | ⭐⭐⭐⭐ 84% |
| Negative Underwear | Minimal | True | Natural | 34DD | ⭐⭐⭐⭐⭐ 95% |
| Parade | Alpha Sizing | Stretchy | Soft | L–XL | ⭐⭐⭐ 68% |
Full Decoder covers 60+ global brands across everyday, luxury, plus-size, maternity, and sports categories.
What the confidence score tells you
Every decoder result includes a confidence score based on brand consistency, community feedback, and fitter observations. Here’s how to read it.
Strong match to known brand pattern. Start with the suggested size — very likely correct.
Likely correct, but a minor band or cup tweak may be needed based on your personal fit preference.
Brand variance is high. Order two sizes and keep the better fit.
High-variance brand. Rely heavily on sister sizing, brand fit guides, and trial fitting.
How to decode your size across any brand
Confirm your true base size
Measure snug underbust and bust at the fullest point, or use the Bra Size Calculator. Your measured size is your anchor — not the tag on your current bra.
Know your sister sizes
Tighter band: go up one band, down one cup. Looser band: go down one band, up one cup. All hold the same breast volume.
Check brand personality
Is the brand tight or stretchy in the band? Shallow or deep in cups? Structured or soft in fabric? Use the conversion chart above.
Order strategically
Try your suggested size and one sister size when confidence is mid-range. Keep the one that passes the band, cup, and strap test — not just the familiar label.
- Full band and strap adjustability
- Best for large busts, high support needs
- Helpful when between sister sizes
- Adaptive stretch with firm recovery
- Best for daily wear, desk work, travel
- Works well switching US ↔ UK systems
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Test any new brand size in 30 seconds
No tape required. These three checks tell you whether a new size works — regardless of what the tag says.
Built for 2026 shopping — not 2008 mall logic
Most size conversion sites list 3–5 brands, ignore band tension, ignore cup depth architecture, and haven’t updated since SKIMS launched. This is different.
- Covers 60+ global brands including everyday, luxury, plus-size, maternity, and sports.
- Adapts to regional sizing systems: US, UK, EU, AU/NZ, Japan, FR.
- Incorporates elasticity logic, band tension profiles, and sister size mathematics.
- Provides fit confidence scoring from 50% to 95%+ based on brand consistency data.
- Updated continuously as new brand patterns are observed and verified.
Stop guessing across brands
If you’re tired of buying three sizes every time, returning “almost right” bras, and blaming your body for inconsistent labels — use the Brand Size Decoder™. Enter your size once. Translate it everywhere.
Brand Size Decoder FAQs
Why does my bra size change between brands? +
How do I convert my bra size between brands? +
Why am I a 34DD in one place and a 34G in another? +
What brands run small or big in the band? +
What brands run bigger or smaller in the cup? +
What is my sister size if I am a 34DD? +
What size should I try at Victoria’s Secret if I am a 34DD? +
What size should I try at Skims if I am a 34DD? +
How do I choose my size when trying a new bra brand for the first time? +
Your body did not change. The brand scaling did.
Your size is not a single letter — it is a range that shifts with design philosophy, fabric elasticity, regional systems, band tension, and cup depth architecture. Once you understand that, shopping becomes a strategy rather than a source of frustration.
Welcome to global, brand-smart sizing. Happy decoding.
