I went through puberty at 11, so I had my bust and hips early on and I've stayed my height since I was about 13. Canadian sizing is extremely close if not the same than US (:  I'm trying to imagine a size 16 (I don't regularly associate with people of that size) and  then put it in my head on a 12 year old and it's just unthinkable. Especially if she's around 5 foot or less.