I've tried a few thngs, but like someone else said I've gone for cinching in my waist rather than making my hips bigger. I've tried various control underwear for this, and get mixed results, though nothing is great. THey do give a little curve though. I've got a Charnos waist cinching girdle I got from eBay which takes a few in from my waist, though it makes me more af a 5 minute glass than the full hour

I've come to the conclusion that most of these work on women, but less so if the shape isn't naturally there.
The best results are with boned corsets, but these aren't the easiest things to wear
Keeping your waist in trim is a good start though, so sit-ups and crunches help pull in the waist, and not forgetting ading some twists for the obliques that are at the side. Pilates is good to target this area and the core muscles that hold everything in your tummy. General aerobic exercise will help burn the fat that collects round your tunny too as situps won't burn fat, only tone the muscles underneath
The best thing to do without the discomfort is just go for clever use of belts, longer tops and other clothes to make it look like you have a waist and hips, It's also surprising what you can get away with, and few people will notice you not having the classic pear shape (as a lot of women don't)