Well, on the form we have to fill out, there are different spots for men and women. The women's sizes are Small, Medium, Large, and X-Large. The men's sizes are Small (34-36), Medium (38-40), Large (42-44), X-Large (46-48), and 2X-Large (50-52). I don't really know how it works, or if it's a big deal or not, but I don't want to get stuck with a coat that doesn't fit. I just wish the sizes weren't quite so ambiguous.
Edit: I sent an email asking about the sizes, and the response I got is that the sizes are approximately Small (8), Medium (10), Large (12), and X-Large (14). I hope that helps anyone else who was wondering.