I ordered a women's XL-Shirt from the shop, and it fits - and it's a little tight around the chest.
But since I'm not really fat I do agree that it's a pity that the sizes are a little misleading ... maybe S should be called XS and so on - and it would be nice to have a "real" XL-size for girls, too.
Anyway, last night at the concert in Frankfurt I wore my shirt - and was obviously the only one in the audience. It felt good ............ 