SIMIYA Tummy Control Knickers, High Waisted Shapewear for Women, Tummy Control Body Shaper Pants Shaping Underwear

What size do I buy if I'm a 16/18 in trousers

I'm a size 14 in knickers, as my bum is small but an 18 in trousers as i have a big tummy. I want to flatten it under a dress, what is the best size?

Im a size 14 what size should i purchase

I'm a dress size 14 what size do I buy