Some may use corsets, and my sister swears by Spanx (though I don't know how well it would work under a wedding dress). I didn't have any shapewear when I wore my dress, but since it was an empire waist, it was okay.
Someone else told me about spanx. I will have to invest in aomething the weight is coming off but slowly. My dress is a little form fitting.
I would definitely try it out as many women have had positive experiences with them. If you have a Lane Bryant near you, I think you can go and try some on to see if it will work for you.
I will be buying the old fashioned girdle and long line bra.