The boyfriend jean. The antithesis of the skinny denim, the cigarette pant, and any other style that makes anyone over 115 lbs appear to have drum stick chicken legs.
The best thing about the boyfriend jean is the ability to dress it up with a tiny jacket and heels or dress it down with flats and a plain white tee. Just make sure you don't go billowy on top- then you'll just look like a floating parade balloon.
The only minor adjustment I have is this: if you're petite, always, always, wear them cuffed. I ordered these yesterday and can't wait to break them in.