J.Crew offers lots of pant styles: City, Wide, Favorite, and Original-fit. For denim there are: Matchstick, Trouser, Bootcut, Hip-slung, and Boy-fit.
Although I own several pairs of J.Crew pants and denim jeans, I have stuck to the same styles: city-fit, wide-leg, and trouser cut. I find these styles look best (e.g. the most flattering) on my 5'8" pear shaped frame. Whenever I try to stray, it ends up with a return of the product. I don't even dare try on the matchstick jeans in fear of the outcome (which would probably be a reminder that I am not as thin as Kiera Knightly!)
As a help to others who are unsure what style to get: What is your body style and favorite style?