I'd say size down, I got a D at size 14/16 but have since bought a C which fits much better although I am a little smaller too now but I found they were a big fit. Brilliant though! Wear dresses so much more nowWhat size do Snag tights/chub rub shorts go up to, please? I think in an earlier post, it was said that an E is an 18, so, at a size 26/28, I would be an I or a J. I have always wanted to try them, as they have so many fun colours!
Make sure you rinse them after every use in cool/cold water to get the chlorine/salt water out of them, then leave to dry flat.