I bought some big support pants to wear under a slinky frock, the sort that goes up to your bra.
They looked awful, I had a pouch of back fat then they rolled down mid evening, I ended up taking them off.
M&S seem to be a slip that you wear with your own bra, has straps so no rolling but its 32# which seems pricey.
I don't have too bad a tummy but have got an awful muffin top which needs smoothing.
Any ideas?