I am off to a mall today with a John Lewis, MandS etc. I don't have my exact measurements but I am definitely around the 14-18 size thanks to disparity of sizes.
I am off to a wedding soon and I would really like something that is going to hold my stomach in for a particular dress. I haven't brought anything like this for a few years, and I would perhaps rather see it in store than order online - but open to advice!