Hello TrickB! I too am petite. Throughout the years i've collected a number of signature pieces for a professional look as well as evening wear from the places listed below. Also, I thought i should let you know that i've never purchsed a pair of pants that were ready to wear, even jeans- all had to be altered. Here are a few places to look over. These links will directly take you to their store locator.
Other Places I don't normally go to, but you may find something you like:
*Most department stores like Strawbridges, Macy's or JC Penny's have a petite section for women, but if you're looking for jeans, skip those listed b/c they tend to have more of the "mom jeans", but you may have luck at the high end dept. stores. Did i mention how much i love dept. stores?!?
& finally, my greatest gem would be Korean clothing boutiques b/c they pretty much carry only petite sizes. I've gotten, most all of my trousers from various Korean clothing places that are usually located in your nearest Korea-Town or strip where they have Korean stores bunched together. I love having unique clothing and can find things like elegant & full collared white button-down shirts for work and dressy tops.