I read an interesting discussion. It's in Polish, which means that I have to explain it.
Basically, the reason was the frustration that came from standard clothes sizing. Clothes are sewn for "average" women, that are probably rectangles with small bust. Many, many women just can't find decent, fitting clothes in stores - either you have to buy something stretchy, or pay for an alteration. With my prominent curves, I have the problem myself. My waist and shoulders are about two-three sizes smaller than my bust and hips. There are some stores that sell clothes for curvy women, like Bravissimo, but they're in minority.
The general idea was a letter after the standard size. For example, you'd have a 36X dress for hourglassy gals, 36A for pears, 36V for inverted triangles, 36O for apples and 36H for rectangles. The major drawback is that there are more than 4 body shapes - and what should I look for with my small shoulders and big bust? Anyway, the idea itself is nice. Clothes for young women are usually sewn to fit a boyish shape, while clothes for mature women have more space for boobs (and tummy as well).
I talked to my mum about it. Being a totally different shape from me, she agreed that we both need different clothes, even if we wear the same size (she's a rectangle with pear tendencies and small bust, I guess).
What do you think?