I'm not petite, either, and have to contend with chunky upper arms & a larger chest.
I find things that fit closer to the body (i.e. - ON "Perfect Fit") or have seaming (I am a big fan of darts & princess seams) and a little bit of "structure" to them suit me best.
I'll let you know if that changes after Baby, though! (I know I will be self-conscious about post-baby baby-belly, but I don't want to dress like a frump!)
==========================================
Liz
DD (3/2010)
"Make mistakes! Get messy!" - Miss Frizzle