I don't understand, I am more often than not a size 8 from the waist up, otherwise a general size 10. I have bought the Santorini tankini in size 10 and it's tight. It looks so good otherwise. I am gutted as I got it from the clearance section in Next for half the price but they don't have a bigger size and Boden don't have it in blue. Those of you who use the Santorini swimwear, do you find that you have to size up?