This is interesting. I originally signed up as a B because over time I have developed a bust and my tummy is not flat enough for A, I thought. But having seen a true hourglass figure, I reasized I'm still an A and switched to that. However my shoulders slope down, they are not square so I find a lot of the advice 'off' for me. Clothes don't hang quite right. And I liked the styles shown for B better than for A, as they help give the illusion of having a waist. I checked out trinnyandsusanna and I am a cornet, as my silhouette is still very much straight up and down. Having grown a bosom and a tummy did not improve the look of my waist!