32D vs. 42B Bra Size Comparison: Why 32D Is Larger Despite Smaller Band

32D is the larger bra size.

Why?

Bra size = band size (ribcage) + cup size (bust-band difference).

• 32D: Band = 32″; Cup = D (larger volume).
• 42B: Band = 42″; Cup = B (smaller volume).

Although 42B has a larger band, the cup volume of D is significantly larger than B, making 32D the larger overall breast size. Cup volume scales with band size, so a 32D holds more tissue than a 42B.