I'm only 5'0 and my shoulders are straight and broad plus I have a C cup. And an apple belly so not much of a waist. Here are some of my favorite jackets right now.
Pic 1 is Alfani (petites) from Macy's -- it is a sweater knit jacket so stretchy. I sized up to a Medium so I could close it at the waist when I want to. I have a red jacket somewhat similar to this (regular sleeves) from WHBM so do give them a try.
Pic 2 is Ann Taylor (petites) -- similar to the ones Runcarla suggested. Once again, I found I had to size up to accommodate the chest. This one does close with no gaping. The only issue is the sleeves are a bit on the longer side for me but as you see I have scrunched them here. I have this same type jacket in several different fabrications (white, off-white tweed, soft grey tweed) and all from AT. I also like their piped jacket that has lapels: that one fits really well too. In some of these jackets I did NOT size up as I just wear them open.
Pic 3 is a longer line (hits at mid thigh) throwing out all the rules and is even worn with flats! I do think straight shoulder women can wear this style particularly well! I have yet to try this with a dress but think it'd work over a knee-length or slightly shorter sheath.
Not shown I have a black suit jacket from Banana Republic. I had to size way up in that one (not sure what is going on with BR sizing these days) but it fits like a dream. I do love BR suiting.
As you can see the theme is that I had to size up! The petite still gives me the vertical proportions I need, but for the shoulders/chest/belly I need to size up. I do not like any pulling across the back, and I like to be able to cross my arms comfortably.
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