Honestly just follow the size guide and you should be okay. Allow yourself an extra inch if possible - especially if you have a couple months to go till your con. I got my order within 3 weeks of ordering and everything looks really good! The only thing I can complain about if that the tunic for one of them was supposed to be kind of like a dress and it barely covers my butt. Otherwise I'm so happy with what I got and was really impressed by the quality of material and that the sizes were true to the guide.