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[–] deathhawkbitch 0 points 1 point 1 point (+1|-0) ago (edited ago)
So here's where it stops making sense.
The general rule of thumb is that if you go up a band size, you go down a cup size, and vice versa. Bands only come in even sizes (typically, there's some brands that do custom sizes). So even though you're moving 2in in either direction at the ribcage, it's treated as an equivalent to 1in of breast circumference when going between sizes. It does work, and it helps if say, you have a solid 35in ribcage and a 34C is too tight around but the cups fit, you can try a 36B and know the cups should still fit.
http://assets.biggerbras.us/guides-fitting-help/fitting-bras/graphics/sister-sizing.jpg