Shapewear

Harvest festival drawers she used to call them (my grandmother)

Yes. Mine too! ?

I really wouldn’t bother with shapewear. I’ve tried various styles and none of them have been successful.
Without being too blunt, the ‘excess’ has to go somewhere Shapewear either pushes it up, down or in - none of which look / feel good. Go for comfort and celebrate the lovely, female body that you have

Totally agree LizzieDrip I wore an expensive all in one thing to a family wedding as my dress was quite fitted, I took the advice from a friend who swore by them & regretted it. I could definitely feel where the excess was being pushed. They can end up making you look a strange shape and leave you feeling so hot & uncomfortable especially when you’re eating. Id buy a bigger size dress or wear something more floaty as others have advised.
I remember my mum squeezing into tight panty girdles in the 60’s when she didn’t even need one, they were much the same, awful things.