I have two underworks hip pad briefs. The shape is great HOWEVER the material is very course and not comfortable at all. The material used is something from your grandma's girdle in the 60s.
I also have a set of the silicone hip pads mentioned above. The problem here is if you do any activity like walking, dancing, biking golf, tennis, anything where you sweat the silicone pads get clammy and worse can slip from the position you originally attached. This company also sells a cheaper version for about $100 but the foam is way to stiff and is a waste of money.
Unfortunately these hip pad options are not good for all day wearing. I make my own using foam. This does require a lot of work to make but they are by far the best in terms of fit and comfort. I use spanx or other similar shapers to hold them in place.