You might try this and get a size that sounds totally wrong. “No way am I a 32DD,” you might think. But trust the math.
Here’s why many women mess it up: we’ve been taught that an A is “small” and a D is “huge.” That’s a silly, outdated lie. A 30D is actually a very common, medium size—it just has a small band.
Think of it like pineapple on pizza. People have strong opinions, but the measurement doesn’t lie. It’s just data. Once you accept that your cup size might change, you unlock a world of comfortable bras.
The “Sister Size” Secret
Here’s where it gets even more interesting. You know that bra that almost fits but the band rides up? Try a sister size.
Sister sizes are bands and cups that hold the same volume. If a 34C is too tight in the band, a 36B will hold the same amount of tissue. The cup letter shrinks as the band grows.
This is the hack professional fitters use. It’s like swapping a size 8 dress for a size 10—the fit changes, but the shape stays similar.
