I wonder how these run in size. I'm between a small and medium in juniors sizes in the us but can't decide if I should get an 8/10 or 12/14. I don't want them to shrink and be tight but I also don't want them so baggy they're falling off.... I'm looking at a pajama set if anyone's bought one and can tell me how it runs... I read that it's 100 percent cotton.