Thank you for being part of it!
I havent been able to read all of the comments on this thread, but I've seen Amani wear waist-high costumes that are quite beautiful. Then again, like Sedonia said, they are no costumes that are designed to emphasize the hips. There are costumes out there designed to be on the waist I think, but I think they'd best be designed for you or custom made etc. Which might get quite expensive I think.
When I didn't want to show my belly at first I wore baladi dress or Cabaret dress. I've gotten comfortable showing my belly quite soon after, but the dresses come in beautiful forms. You could even get one with pretty cutouts that might emphasize other parts of your body (like your waistline, the sides of your belly, your back...). Mesh stockings sound great too. I'm considering getting some. Not because of the camouflage though, I just love the way they look, so... I don't know, I just really like the look.
The costume is I think part of the dancers image and I think both dancer and audience would be happy if the costume put emphasis on the dancers assets. If the dancer doesn't feel comfortable in her costume, people will see that also and might not feel so comfortable about it either. I hope you find something that suits you! Good luck finding a costume!