I am consistently a 39/8.5 in clogs, clog sandals, and clog boots.  I have a higher heeled clog from this company in a 39, so I ordered these in a 39 as well.  So of course I was disappointed when I got them and they were just a little bit too big; the sort of "too big" that could be livable, but I knew that, ultimately, I wouldn't be happy.  I prefer a tighter fitting sandal that doesn't float around my foot, especially if it is a peep toe version.  I contacted Lotta From Stockholm regarding the sizing and the need for an exchange.  They confirmed that this particular style had a more generous fit. They were AMAZINGLY helpful with the return process.  I did have to pay the return shipping to the U.K. (which ran me about $26), but they paid the shipping for the exchange item.  They even had suggestions for postage options.  I got frequent emails throughout the process and received my new sandals, in a 38, in practically no time.

My advice for anyone buying these for the first time would be to email Lotta about their sizing as it can change slightly between styles.  These sandals are worth the wait!