ThirdLove vs Aerie Bra Size Comparison
Wondering how ThirdLove and Aerie bra sizes compare? Both brands use standard US bra sizing, so a 34C should be the same measured size in either brand. But fit, size range, and style vary — here's a detailed breakdown to help you find your perfect size in both.
ThirdLove
Everyday bras
Size Chart: ThirdLove vs Aerie
Common bra sizes compared across US, UK, and EU systems for both brands.
| US Size | ThirdLove UK | ThirdLove EU | Aerie UK | Aerie EU | Bust (cm) |
|---|---|---|---|---|---|
| 32B | 32B | 70B | 32B | 70B | 85 |
| 34B | 34B | 75B | 34B | 75B | 90 |
| 34C | 34C | 75C | 34C | 75C | 93 |
| 34D | 34D | 75D | 34D | 75D | 95 |
| 36C | 36C | 80C | 36C | 80C | 98 |
| 36D | 36D | 80D | 36D | 80D | 100 |
| 38DD | 38DD | 85E | 38DD | 85E | 108 |
Both brands use standard US bra sizing. UK and EU equivalents follow the same conversion.
How ThirdLove and Aerie Fit Differently
Both ThirdLove and Aerie run true to size, so your size should translate directly between the two brands. The fit differences come down to style and construction rather than sizing.
ThirdLove Fit
ThirdLove is known for their half-cup sizes (e.g., 34.5B) which provide a more precise fit between standard cup sizes. Their bras tend to run true to size with a focus on comfort.
Aerie Fit
Aerie bras run true to size. Their Real Sunnie line is known for comfort and a natural fit. Wireless styles offer relaxed support. If between sizes, Aerie generally recommends sizing up.
Does ThirdLove or Aerie Run Bigger?
Neither brand runs significantly bigger or smaller. Both ThirdLove and Aerie fit true to size, so your size should transfer directly. The perceived fit difference comes from construction — different materials and padding levels affect how the same size feels on your body.
Size Range Comparison
| ThirdLove | Aerie | |
|---|---|---|
| Size range | 30A–48H | Standard |
| Fit | True to size | True to size |
| Focus | Everyday | Everyday |
Which Brand Is Right for You?
Choose ThirdLove if you want:
- ✓ Comfortable everyday wear
- ✓ Sizes 30A–48H
- ✓ Consistent, true-to-size fit
Choose Aerie if you want:
- ✓ Comfortable everyday wear
- ✓ Consistent, true-to-size fit
Not sure of your size?
Use our bra size calculator to find your size in ThirdLove, Aerie, and 12 other brands — all from your measurements.
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