When you're in the dressing room trying on a pair of jeans, the first thing to look for is the fit. A relaxed fit (that's not baggy) is flattering for most women. It's more comfortable than other fits, as well -- while some ladies like painted-on jeans, it's hard to work the room with confidence when you can barely breathe. You should make sure that the jeans fit you just right in the areas where you're largest, because you can always have the other areas taken in.
Watch for things that may not be flattering for an inverted triangle body type. Jeans with no pockets or large rear pockets will make your tush look less shapely. Dark, solid-colored jeans will make your hips look smaller, and standard, straight-legged jeans will make your waistline less defined. Jeans with really small waistbands are not flattering for inverted triangles, either.
Now, look at your shape in the mirror, and check those crucial areas. Does your waist seem cinched in compared to your hips and thighs? Do the rear pockets accentuate your booty? If not, it's time to try another pair.
Making that trip to the dressing room is essential when you're buying a brand or style of jeans you haven't had before. Don't be afraid to try on as many pairs as you need to before you find the right one. Don't worry -- you won't be the first customer to spend lots of time in the dressing room, so the salespeople are used to it. Once you've found a brand and style of jeans that's right for you, you can check online for bargains and the convenience of delivery. But make sure you invest the time and effort in the beginning -- it'll pay off when you stroll into the party and catch every eye in the room.