Qutieland Tea Party Sizing Question

[cillianne.livejournal.com]

Girls, I need your help - I'd like to purchase a pair of tea party shoes from Qutieland, but I have a question about sizing. I always wear shoes size 38, but Qutieland only offers 37 (size M) or 39 (size L). What size would you recommend me? Do they run small or big? Or should I stay away from them?
Thanks!