Control pants. Please discuss.

Since I have been trying to dress this new, more curvy body of mine post-pregnancy, I've discovered a little secret among women. Control pants. Suddenly, all sort of women are telling me about their Spanx – control undergarmets that suck in everything from thighs to bums to tummies to back fat.
Recently, J-Lo was photographed with her dress blowing up to reveal some serious control pants:

Jennifer Lopez

I also remember reading about Gwyneth post-birth and she told an interviewer that Brazilian women wear these incredibly tight control pants that suck in their tummies for up to 20hrs a day after giving birth.
It's never occurred to me to buy these kinds of garments because I thought they were only for grannies and Bridget Jones. But even women who've never had kids have told me that it gives you a really smooth line under dresses. Goodness. A whole new category of clothes I never knew I needed to have.

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