Bra cup size A too big for many women. Bra cup size A too big? It is a fact that women with all kind of breast sizes can be wearing a wrong bra size at the moment. Stories on the internet keep telling us this. And I must say. It is quite true. Measuring other women I found out that an average of 2 out of 4 women is wearing a wrong size bra. What did I find…"Bra cup size A too big for many women. This is why!"