Please check the measurement chart, which shows clearly that the Delfina kneesuits are smaller sized than the rest of the Delfina swimsuits, so you need to buy them at least 2 sizes up.
Please read this note for size advice: I am a size 14 and about 1.58m tall. I fit in a size 34 in swimsuits and size 38 in kneesuits with extra stretch room at the straps, but no extra room on the body. A customer size 14 but tall 5'11" fitted in size 44. I had customers size 18 / 20 in clothing, fit in size 44 kneesuit, but some customers say that they are size 18 and the 44 didn't fit.
?When you look at the chart, please make sure you look at the kneesuit measurements in particular, as a size 44 is only 42 cm measured flat across the hips!!! If you received the kneesuit and you try it on, please note that they stretch a lot. It feels stiff, especially as it is fully lined (including the legs), but it does have lots of stretch in it!