Only a costume party or a bad allergy can make me wear a dress or a skirt. Thus, I appreciate the gurus who invented 
About less than a year ago, I saw an episode on Oprah with Stacy London (a denim genius) and here are her recommendations for the JEANSstrucks like me.
1. Tall women: make sure the hem falls to the bottom of your heel in the back to avoid high-waters
2. Petite: choose straight leg, not boot cut, no cuffs
3. Tummy Troubles: choose a boot-cut jean, mid-rise that hits across the belly, not above or below it
4. Large Hips: mid-rise, straight or trouser leg which falls from the hips to create a longer-looking leg line
5. Big Booties (Derrière): Stay away from flap pockets or pockets with heavy embellishment or embroidery, find a rise that fits properly in the crotch
6. Flat Tush: Look for jeans with flap pockets, heavy embellishment or embroidery. Slightly higher back pockets can also help make the bottom look lifted
7. Top-Heavy Body: almost any brand will do. Just be sure to choose a jean that has a lighter wash, some bleaching on the leg or whiskering. Distressed denim helps add volume to the lower half without adding actual bulk and helps balance the body line.
8. Jeans too big in the rise: Stacy says if your jeans fit everywhere except the rise—that is, the crotch—it may be because you have a longer torso and shorter legs. If so, even if you are taller, try on a petite pair of the same jeans. You may find they fit infinitely better in the rise and the leg.
