I'm late to this question but I couldn't resist answering. Thank God someone has the same weird problem! You just made my day PF I have a AA bust and a very large ribcage. Even when I was slightly chubby, and filled out on my lower half, you could still count every rib, especially near my sternum. Luckily I have loads of suggestions for you. First off, you're right about scoop necks, avoid them like the plague. Even if your chest were not bony, with a bust as small as yours, scoops necks are just not flattering. Wide -v necks, and even v-necks of average width, are also not the best choice, although they're not as terrible as scoop necks. What you need are narrow, "sharp" v-necks, or shallow v's that stop just below the collarbone. Here are 2 great examples - shallow v neck: http://www.tulle4us.com/tulle/sweaters/A1232/
extremely narrow v-neck: http://bananarepublic.gap.com/.....pid=671277
You should also try high-neck tank tops with very "cut-in" shoulders, as oppose to the wide-set "Jackie O" shoulder line, typically seen on sheath dresses and knit "shells". Here's an example of a tank-top with a high neck and completely exposed shoulders: http://www.freepeople.com/inde.....89d64f3e5/
Incidentally, this is probably the ideal neckline for a dress for you. Combined with a deep exposed back, and a knee length hem, there is probably no dress style more flattering for our body type. In fact, it's likely you won't need a push-up bra (or any bra, for that matter) to look great in it. Another thing you MUST own, is a thin knit sweater, with a high cowl neck. Just avoid cowl necks that are so high on the neck that they cross the line into turtle necks. However a massive, voluminous cowl that would look crazy with a capital C on anyone else, will be an arty, refined, statement piece on you. Here's a great example of a cowl neck sweater: http://piperlime.gap.com/brows.....&ap=7
You can also wear puffy, furry, or otherwise 3 dimensional statement lapels if they end deep on the chest, rather than being wide and shallow. The jacket angie is wearing in this photo would be lovely on you, even though she has a decent size bust: http://youlookfab.com/2009/10/...../#comments
The previous look is better for oudoor outerwear, although it can be done indoors if you have the chutzpah But for indoor jackets, I recommend a narrow neckline, and very thin, long lapels, combined with a one button closure. Here you go:
http://www.ae.com/web/browse/p.....0423bb4e79
I also like fitted jackets without lapels (hard to find, but well worth it): http://www.urbanoutfitters.com.....prepushId=
Last but not least, you should get yourself some highly embellished boleros or vests: http://www.bluefly.com/Autumn-.....0423bb4e79
Last one, I promise (this is a picture of a little girl, but you get the idea): http://www.chasing-fireflies.c.....#038;id=YP
As for your other question, you can definitely wear open necklines and fill them in with chunky, v-shaped bib necklaces, or layered strands, but you still should not wear wide v's or, god forbid, scoop necks. Try subtle strapless sweetheart necklines instead. Hmmm, I hope that helped you, and that you actually managed to read the whole thing:) I doubt Angie will see this, but I'd be interested to know if she agrees with me, especially since these are the rules I live by when it comes to choosing tops.