Seems like most women wear the wrong size bra for a good portion of their bra-wearing years. It doesn't help that the way to measure for a bra MAKES NO SENSE.

I like the way Decent Exposures does it. They say "measure your rib cage" and "measure around at the biggest part of your boobs" and that's it. Those two measurements give you the band size and cup size. No 'wrap tape measure up around under your armpits' nonsense.

(They also make custom bras for about the same price as store-bought bras and they are comfy, especially for larger cup sizes.)