Actually, there is hardly any difference between the size 38 and 40 - both sizes sit pleasantly, Gr. 40 is perhaps a small tick "further" than 38, sits so enjoyable even if you usually wearing a size 38. So it does not fall schlabberiger or so around the waist, but also sits nicely figure hugging. Again, you must not have too large bust, more normal level, so it sits nicely overall.