Low back shapewear

Hi everyone! I am getting desperate looking for shapewear that works with my dress. I need a low back, ideally open bust body suit that goes down at least to my thighs-this is impossible to find. The only thing even remotely close I can find is a Spanx one piece that has terrible bra cups that flatten my breasts and make them push out at the side. This search is killing me- I just wanted one day that I wouldn’t feel self conscious about my body. I thought I found a dress that I loved and made me feel great. When I got it in my size suddenly nothing about it the dress worked. It could hardly get taken in because of the low back and it grazes my narrow hips in a way I don’t like. I just know if I could find shapewear that worked it would make a world of difference. All I want is something to smooth me out. I’ve looked at all the old forum discussions and haven’t found anything yet. My tailor couldn’t cut the bodysuit I had to fit my dress. Please help!!!! Feeling desperate and hopeless...