The easiest way to see why you can't just match up size labels is to keep the measurements the same and see what changes. These examples use each brand's own published ranges to show how different the resulting labels can look.
| Underbust | Bust | Bleuet | Yellowberry core | BRABAR method |
|---|---|---|---|---|
| 28 in | 29–30 in | 12 | S | 28A–28B |
| 30 in | 31–32 in | 14 | M | 30A–30B |
| 32 in | 33–34 in | 16 | L | 32A–32B |
| 34 in | 35–36 in | 18 | XL | 34A–34B |
| 36 in | 37–38 in | 20 | Plus 1 | 36A–36B |
| 38 in | 39–40 in | 22 | Plus 2 | 38A–38B |
The BRABAR column shows the cup range for a one-to-two-inch bust difference. It doesn't mean every BRABAR product is actually stocked in every size shown.
What this actually shows
A 32-inch underbust with a 33–34-inch bust lands at Bleuet size 16, a Yellowberry L in their core cotton chart, and roughly 32A–32B under BRABAR's method. You can't guess any one of those labels from the other two.
Even within one brand, the style can change the answer
Yellowberry's seamless Tulip line uses grouped labels like XS/S, S/M, and L/XL instead of the seven-label chart their core styles use. Bleuet has its own style-specific exceptions too. That's why we track brand + sizing family + measurement range together — not just a brand name and a label.