Yup, the perfect jeans are the ones that fit, and even among women of the same height and weight, body proportion can make a huge difference. I look great in a certain cut of Levis, and terrible in a certain cut of Carrhardts. One brand that looked good on me at one weight (Ann Taylor) is unflattering to me now, because my proportions have changed asi have lost weight and more fat has shed from some areas than others.
All three brands I recommend trying, btw... But no thoughts as to how good or awful they will look. It really must be trial and error. As of late I'm digging my Motherhood Maternity jeans, but I obviously wouldn't recommend those to most folks, either