Usually I make shapes that are, less endowed in the chest area. I spent quite a bit of time in my "new to sl" days as a model for Vitamin-Ci and Extraordinaire, and then later a chunk of time as the Extraordinaire main model and photographer. For the latter stores ads, (and once for a risque lingerie store I won't mention because I'm rather embarrassed my picture is still up selling their outfits) my chest had to be larger, because the outfits were sexy and that was the point...boobs barely contained, almost spilling out. But for the first store, and in general, for most outfits, I preferred a smaller chest size...this ensured me that prims usually fit pretty well and shirt textures weren't oddly stretched out. So most of my shapes...reflect my preference. Staring at my sl mom's ginormous chest, inspired me to create some looks that were more curvy; to stray just a bit from my comfort zone and go less for cute and more for sexy. I don't know if I succeeded, but I had fun making these and I personally like them and hope someone else out there will too.
these are available on the sl marketplace at
https://marketplace.secondlife.com/stores/63494
or in-world at
http://maps.secondlife.com/secondlife/Coruscant/64/171/700